Refuting Creationism - The Evolution of Complexity - No Magic Needed

Stomata on a leaf surface

Credit: Emilio Ermini, CC BY 4.0, via Wikimedia Commons

Stomata on a leaf surface.

How plants evolved a molecular switch to cope with heat

Creationists routinely portray complex biochemical pathways as systems that must have been designed as complete working units. Remove one component, they argue, and the system ceases to function; therefore, by the presuppositional false dichotomy that characterises creationism, all the components must have been assembled simultaneously by an intelligent designer.

Evolution does not work by assembling entirely new systems from nothing, however. It modifies what is already present. Existing proteins acquire new interactions, mutations alter their stability or activity, and old signalling pathways are recruited for additional purposes. A comparatively small change can connect existing components and produce a new, environmentally responsive function.

An elegant example has now been described by Shao-Li Yang and colleagues from VIB, Ghent University, KU Leuven and collaborating institutions. Their study, published in Nature Plants, identifies a molecular pathway that helps Arabidopsis thaliana cool its leaves during heat stress. It also shows how evolution produced the regulatory switch by altering the electrical charge at a particular position in an existing protein.

Plants cannot escape into the shade when conditions become dangerously hot. One of their principal cooling mechanisms is transpiration: stomata—microscopic pores in the leaf surface—open, allowing water to evaporate and remove heat. This resembles sweating in animals, although excessive stomatal opening also risks dehydration. Plants must therefore regulate the process rather than simply leave their stomata permanently open.

The newly discovered pathway centres on UBP24, a protein belonging to a family of enzymes known as deubiquitylases. Ubiquitin molecules attached to a protein can help to determine its location, activity or destruction; deubiquitylases remove those molecular tags. Under high-temperature conditions, B4 RAF kinases activate another kinase, OPEN STOMATA 1, or OST1. OST1 then attaches a phosphate group to the amino acid serine at position 360 in UBP24.

Refuting Creationism - How Our Cells Communicate Was Inherited From Our Bacterial Ancestors

Ancient Calcium Signaling in Cyanobacterial Cells

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Even ancient bacteria possessed intercellular communication structures like humans today | CMFI News

The human body is not an organism assembled from newly invented components according to a unique design. It is the latest product of a continuous evolutionary history in which old molecules, old regulatory systems and old cellular capabilities have repeatedly been modified and recruited for new purposes.

Even something as fundamental to our existence as communication between neighbouring cells has roots extending far back into the microbial world.

Our tissues depend upon cells exchanging ions, metabolites and signals through specialised connections. In animals, structures known as gap junctions form channels between adjacent cells, allowing them to coordinate their activity. They are essential, for example, to the synchronised contraction of heart muscle. Calcium ions also serve as important intracellular signals controlling an enormous range of cellular processes.

It might be tempting to regard such coordinated communication as an innovation requiring the complexity of animals or, at the very least, nucleated eukaryotic cells. However, an international research team has shown that a strikingly similar functional principle operates in filament-forming cyanobacteria—organisms belonging to an ancient bacterial lineage.

As the researchers report in The EMBO Journal, the cyanobacterium Nostoc sp. PCC 7120 forms long filaments in which neighbouring cells are linked by structures called septal junctions. These pass through arrays of tiny pores in the peptidoglycan partitions between cells, permitting metabolites and signalling molecules to move along the filament.

Creationism Refuted - Eurasian Homo sapiens Stopped Eating Insects - Thousands Of Years Before 'Creation Week'

Insects in Chang Moi, Mueang Chiang Mai District, Chiang Mai, Thailand.

Credit: mohigan. Licence: CC BY-SA 3.0, via Wikimedia Commons.

European Homo sapiens ate fewer insects than Neanderthals and tropical populations - Institut de Biologia Evolutiva - CSIC UPF (UPF)

Humans are strange creatures. While we recoil at the thought of tucking into a dish of sautéed maggots, fried grasshoppers or other insects, we happily eat their close arthropod relatives, crabs, lobsters and prawns, and yet the evidence is that this has only been so for Northern Eurasians for about the last 9,000 year.

People are also strange in another way: despite all the evidence to the contrary and with no supporting evidence at all, there are people who believe the whole of history can be compressed into a few thousand years and that animals can be created by magic without ancestors.

For biblical literalists, every human who has ever lived must be squeezed into the few thousand years since the supposed creation of the first couple. Yet evidence preserved in something as commonplace as calcified plaque on ancient teeth tells a very different story: one of several human lineages, changing diets, inherited genetic variation and adaptation to contrasting environments over tens of thousands of years.

In a paper published in Science Advances, Manuel Piñero and Pablo Librado of the Institute of Evolutionary Biology in Barcelona combined two independent sources of evidence to investigate the history of human insect-eating, or entomophagy. They searched ancient dental calculus for insect DNA and examined genetic variants affecting our ability to digest chitin—the tough polysaccharide forming much of an insect’s exoskeleton.

Refuting Creationism - Now It's A Transitional Early Insect - From 324 Million Years Before 'Creation Week'

Palaeoecological reconstruction of the Carboniferous stem-insect Chosha praecursor

From: Tihelka, E., Vásquez, C., Engel, M.S. et al (32026)

Amphibious stem-insect rewrites the evolutionary history of insect terrestrialization---- Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences

A favourite creationist debating tactic is to point to a gap in the fossil record and pretend that the absence of a known transitional form is evidence that no transition occurred. When a suitable fossil is eventually found, the manoeuvre simply creates two smaller gaps on either side of it—or the fossil is arbitrarily declared to be “fully formed” and therefore not transitional. A simple trick which exposes the ignorance and disingenuity of creationism, is to ask them to describe exactly what they would expect a transition fossil to look like. They tend to abruptly break off the debate, because to answer it would violate two unwritten rules of creationism - never consider being wrong and never state what evidence would cause you to change your mind in case it's produced.

This 'god of the gaps' rhetorical game depends upon treating an inevitably incomplete geological record as though it ought to contain a specimen from every generation of every evolving lineage - something that if it were true, would be hard for science to explain, given what we know of the circumstances in which fossils are formed, which actually predicts that the record will be discontinuous.

The early history of insects has offered particularly fertile ground for this tactic. Molecular-clock studies indicate that hexapods diverged from aquatic crustacean relatives hundreds of millions of years ago, yet their small, delicate bodies were poorly suited to fossilisation, especially in the environments through which they were making the transition onto land. Consequently, there has been a conspicuous interval—the so-called “hexapod gap”—between the earliest evidence of hexapods and the abundance of unmistakable insects in later Carboniferous rocks.

Now, an international team led by Erik Tihelka and Chenyang Cai has described a remarkable fossil that helps to narrow that gap while illustrating how the familiar insect body plan was assembled. The approximately 324-million-year-old animal, named Chosha praecursor, came from the Late Mississippian Tesnus Formation of western Texas. Collected in 1985 and long misidentified as a juvenile crustacean, it remained in a museum collection until examination under cross-polarised light revealed anatomical details that had previously been almost invisible. The findings are reported in Nature.

Creationism Refuted - How The Grand Canyon Was Formed - No Magic Flood Involved

Grand Canyon’s oldest and deepest rocks were unearthed by massive cliff across ancient USA.

Lost mega-escarpment across ancient USA may explain Grand Canyon missing billion years

Creationists sometimes point to the Great Unconformity in the Grand Canyon as evidence of Noah’s mythical global flood. But an unconformity is not a layer deposited by a flood. It is a surface representing an interval during which older rocks were exposed, eroded and sometimes deformed before younger sediments were laid on top of them. What is “missing” is not evidence; it is rock that either was never deposited or was subsequently removed, with the surviving rocks preserving evidence of what happened in the intervening time.

Creationists attempts to fit the Grand Canyon into their Biblical flood myth range from the sublime to the ridiculous, none of them in the least plausible and designed to appeal to the parochial ignorance that typifies American creationism. Their conclusion is always sacred and immune to contradiction. Facts are accepted or rejected based on whether they support the conclusion or not. Science, by contrast, starts with a neutral view, collects evidence, then takes a view that accounts for that evidence, as always in science, the facts are neutral and the conclusion provisional, contingent on the discovery of more evidence.

At parts of the Grand Canyon, Cambrian sedimentary rocks rest upon much older Precambrian rocks, leaving more than a billion years of geological history unrepresented by sedimentary strata at that particular location. Far from supporting the idea that the canyon’s rocks were deposited during a single year-long catastrophe, the contact records a succession of events involving sedimentation, burial, tectonic disturbance, uplift, prolonged exposure, erosion and renewed deposition.

A new study published open access in the journal Geology now proposes a mechanism that may explain much of the extraordinary erosion responsible for this gap in the south-western United States. Thomas M. Gernon of the University of Southampton and colleagues have reconstructed a continent-scale escarpment that may have developed along the western margin of Laurentia—the ancient continental core of North America—as the supercontinent Rodinia began breaking apart approximately 800–750 million years ago.

Refuting Creationism - Why Sex Evolved

Recombination by sexual reproduction drives adaptive diversity in yeast

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The why behind sex — Harvard Gazette

For creationists, who typically know little or nothing about evolution and so have no understanding that it is a process that takes place in a population, not an event that happens to individuals, sexual reproduction is a fertile source of disinformation and misunderstanding with which to attack the Theory of Evolution.

For instance, they frequently argue that the probability of the 'first man' and 'first woman' evolving together is so highly unlikely that their myth of the spontaneous creation out of dirt of a man and the cloning of a woman by magic is a far more rational alternative explanation. The science is attacked because when they try to force fit their childish myth of every species having a single ancestral male and female couple into the science of evolution, it doesn't fit well. The possibility of the myth being wrong must never be contemplated, because that would risk having to change their mind.

However, science works by addressing questions, not by throwing stones at infantile straw-man parodies of alternative ideas and declaring victory by default.

For science, sexual reproduction presents evolutionary biology with a different long-standing puzzle. An asexual organism can pass on its entire genome without finding a mate, competing for one or investing energy in courtship. In species with separate sexes, there is also the familiar “twofold cost of males”: only females produce offspring, whereas every member of an asexual population can potentially reproduce.

All else being equal, an asexual lineage should therefore increase more quickly than a sexual one, and indeed there are a few examples of where this is true - a single female vine weevil can quickly populate a window box or plant pot with devastating consequences for the owner as I have found to my cost; a single marbled crayfish can rapidly spread through a new river system, out-competing any native species.

Yet sexual reproduction is widespread among eukaryotes and has persisted for hundreds of millions of years. This does not imply that evolution requires foresight or that sex was introduced by a designer for some future purpose. It means that, under many circumstances, the descendants of organisms that exchange and recombine genetic material must acquire advantages sufficient to offset the immediate costs.

One important advantage is that sex reshuffles the genome. In an asexual lineage, genes are inherited together as a largely indivisible package. A beneficial mutation can therefore carry neighbouring neutral or mildly harmful mutations with it as it spreads through a population—a process known as genetic hitchhiking. Sexual reproduction and recombination can break up these associations, separating advantageous mutations from some of the damaging evolutionary baggage accompanying them.

Creationism Refuted - The Simple Mutation That Made Grasses So Successful - 100 Million Years Before 'Creation Week'

Joinvillea ascendans, a close relative of grass plants. Used in the Study

Photo: Sarah Friedrich.

Maeda and his collaborators sequenced the slow-growing Joinvillea ascendans plant, a close relative of grasses, to compare genomes and learn what makes grass plants unique.

Photo: Sarah Friedrich.

Molecular “bypasses” improve grass plants’ synthesis of lignin and starch, laying the early groundwork for evolutionary success – Department of Biology – UW–Madison

Creationists routinely claim that mutations can only damage genetic “information” and can never produce anything genuinely new. The claim depends partly upon leaving information conveniently undefined and partly upon ignoring the many well-understood processes by which genomes acquire new functions. Gene duplication, mutation and natural selection can preserve an existing function while a spare copy accumulates changes, sometimes enabling it to perform an additional task or participate in a new biochemical pathway.

A new study published in Science provides an unusually clear example. Rather than merely showing that related organisms possess different enzymes, Yuri Takeda-Kimura and colleagues reconstructed how two important metabolic innovations arose during the ancestry of grasses: additional routes for producing starch and lignin. They did this by comparing the genomes of grasses with those of several of their closest non-grass relatives, including Joinvillea, Ecdeiocolea, Pharus and Typha.

Refuting Creationism - Observed Evolution Of Live Birth in the European Common Lizard

European common lizard, Zootoca vivipara

Image credit: Meredith Kimble

European common lizard, Zootoca vivipara

By Ocrdu - Own work, CC BY-SA 4.0, Link

University of Glasgow - University news - Scientists uncover the evolutionary process behind live birth in lizards

Live birth is not a simple characteristic that could be produced by switching a single gene on or off. Retaining embryos inside the mother until they are sufficiently developed to survive requires coordinated changes in gestation length, uterine physiology, eggshell formation, gas exchange, nutrient transfer, hormonal control and the maternal immune response. To creationists, this is just the sort of complex biological system that must supposedly have appeared complete and fully functional in a single act of creation.

But that is not what the genomes of living animals show.

In a study recently published in Current Biology, an international team led by Dr Hongxin Xie of the University of Glasgow has reconstructed how live birth evolved in the Eurasian common lizard, Zootoca vivipara. The transition did not depend upon one miraculous genetic leap, or even upon one or two mutations of exceptionally large effect. It arose through natural selection acting upon numerous genetic changes distributed across the genome and accumulated over an extended period.

Refuting Creationism - How Death Stalked South America In The Form Of Giant Crocodylians - Over 10 Million Years Before 'Creation Week'

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[credit]

Reconstruction of Purussarus neivensis attacking Pericotoxodon platignathus.

Image: Miguel Hernandez.

Giant crocodylians dominated the food chain in Miocene South America | University of Helsinki.

If the Young-Earth creationist claim that there was no death, suffering or predation before Eve’s supposed ‘sin’ were true, four fossil specimens preserved in museum collections in Colombia should not exist. They are the remains of large herbivorous mammals bearing punctures and other damage attributed to the teeth of a giant crocodylian—and they are between approximately 10.5 and 16 million years old.

In other words, these fossils are not merely the remains of animals that lived and died millions of years before there were humans to commit any biblical ‘sin’. They preserve physical evidence of animals attacking—or, at the very least, feeding upon—other animals in a functioning predator–prey ecosystem more than a thousand times older than the entire universe imagined by Young-Earth creationists.

The evidence is described by Oscar E. Wilson of the University of Helsinki and Jorge W. Moreno-Bernal in a paper recently published in the Journal of Vertebrate Paleontology. The researchers examined four specimens belonging to three species of large, now-extinct South American ungulates from the celebrated La Venta fossil assemblage of Colombia: the toxodontid Pericotoxodon platignathus and the astrapotheres Xenastrapotherium kraglievichi and Granastrapotherium snorki.

The skulls and jaws bear puncture marks and, in some cases, substantial deformation caused by a powerful bite. From the size and shape of the marks, together with the force apparently needed to produce the damage, Wilson and Moreno-Bernal identify the most likely culprit as Purussaurus neivensis, an enormous relative of modern caimans that may have reached about seven metres in length and weighed approximately 1,800 kilograms.

Middle Miocene South America contained an ecosystem unlike anything living today. The continent’s long geographical isolation had allowed native mammals—including toxodontids, astrapotheres, ground sloths and glyptodonts—to diversify independently. Around the immense tropical wetlands lived giant snakes, flightless predatory ‘terror birds’, terrestrial crocodyliforms and several kinds of aquatic crocodylian. Because large mammalian carnivores were comparatively scarce, reptiles such as Purussaurus occupied the major apex-predator niches.

Earlier studies had inferred this ecological role from the animals’ size, anatomy and the composition of the La Venta fauna. The newly reported bite marks provide direct physical evidence that giant crocodylians interacted with—and probably preyed upon—some of the ecosystem’s largest herbivorous mammals. Purussaurus may therefore have helped to regulate herbivore populations, much as large predators influence prey populations in modern ecosystems.

For creationists, the problem could hardly be clearer. These animals lived, competed, killed, fed, reproduced and became extinct millions of years before any known hominin existed, let alone the mythical couple blamed in Genesis for introducing death into the world. Even if an individual bite mark resulted from scavenging rather than an actual attack, that alternative still requires a dead animal, a flesh-eating crocodylian and an established ecological system based partly upon the consumption of carcasses. It offers no refuge for the claim that the pre-Fall world was free from death and carnivory.

Refuting Creationism - How Humans Evolved, Migrated And Interacted In The Nile Valley - 34,000 Years Before Creation Week'

The history of Homo sapiens in Africa between 44,000 and 3,000 years ago was one of isolation, migration, interaction and replacement a shown by characteristic inner ear labyrinth morphologies.

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Research paper: Bony labyrinth morphology reveals deep population history and isolation among Homo sapiens in prehistoric northeastern Africa (44–3 ka) | Nature Communications

An international team of biological anthropologists has found a novel way to reconstruct tens of thousands of years of human population history in north-eastern Africa: by examining tiny variations in the shape of the bony cavities that once contained people’s inner ears. It's not good news for creationists so it'll be just one more thing for them to ignore one way or another.

The researchers, led by Nicolas Martin and Isabelle Crevecoeur of the PACEA laboratory at the University of Bordeaux and the French National Centre for Scientific Research (CNRS), have published their findings in Nature Communications.

The bony labyrinth is a complex system of cavities within the temporal bone of the skull. It surrounds the cochlea, involved in hearing, and the semicircular canals, involved in balance. Although its shape varies subtly between individuals and populations, much of that variation reflects inherited ancestry. High-resolution micro-CT scanning allows the labyrinth to be reconstructed and measured in three dimensions without damaging the remains.

This makes it especially valuable in regions such as north-eastern Africa, where heat and other environmental conditions have frequently destroyed ancient DNA. When molecular evidence is unavailable, the shape of the inner ear can preserve an anatomical record of biological relationships between ancient populations.

Martin and his colleagues analysed 194 bony labyrinths belonging to 148 individuals. Their sample included people who lived between approximately 44,000 and 3,000 years ago in the Middle Nile Valley, the Horn of Africa and Central Africa, together with comparative specimens from elsewhere in Africa, Europe and the Levant. The researchers applied three different methods of shape analysis, all of which produced the same broad patterns.

Those patterns reveal a long and complicated history of regional continuity, isolation, migration, interaction and partial population replacement. Late Pleistocene and Early Holocene hunter-fisher-foragers from the Middle Nile Valley showed broad morphological similarities both to one another and to still earlier African Homo sapiens. This is consistent with deep regional ancestry and substantial biological continuity extending across many thousands of years.

That continuity was disrupted during the Neolithic transition. Beginning about 8,000 years ago, food-producing populations with distinctly different inner-ear morphologies appeared in the Middle Nile Valley, supporting the conclusion that pastoralism and agriculture arrived with migrating people rather than being adopted solely by the region’s existing foragers.

This was not necessarily a simple or complete replacement. Individuals retaining affinities with the earlier foragers survived for several millennia in areas bordering the Nile Valley, while some remains display combinations of characteristics consistent with limited interaction or admixture between the old and new populations. Samples from the Horn of Africa and Central Africa also showed considerable morphological diversity, indicating population substructure and differing regional demographic histories.

These results independently support earlier research by Martin and many of the same colleagues, which detected a similar Neolithic population discontinuity from the internal structure of ancient teeth. A CNRS account of that earlier study explains how enamel–dentine junctions revealed population replacement and continuing interaction along the Nile and its Saharan margins. Now two independent anatomical systems—teeth and inner ears—have produced compatible reconstructions of the region’s population history.

This presents creationists with the familiar problem of evidence that should not exist if their mythology were true. According to the young-Earth version of the biblical story, the entire human population was reduced to Noah’s family only a little over 4,000 years ago. Every population on Earth must therefore have descended from that tiny group after an extraordinarily rapid dispersal from somewhere in the Middle East.

Unintelligent Design - The Perpetual Evolutionary Arms Race In Your Gut

Certain bacteriophages found in the human gut have mutation hotspots scattered throughout their genomes that help them modify key defense genes, researchers report.

Credit: Sundharraman Subramanian and Alaina Pabbathi
Cryo-EM Core Facility
Michigan State University

Mutation hotspots help 'friendly' viruses outmaneuver the bacteria in your gut

One of the more persistent creationist falsehoods is the claim that mutations can only damage or destroy genetic information and can therefore provide none of the variation needed for evolution. The claim is usually protected from contrary evidence by leaving “information” conveniently undefined or by dismissing every beneficial mutation as merely a “loss of function”.

However, a new study by Jasper B. Gomez, Jeffrey E. Barrick and Christopher M. Waters of Michigan State University provides an especially clear demonstration of mutation generating heritable variation on which natural selection can act. Their findings were published in Nature Microbiology.

The researchers found that the genomes of the bacteriophages T2 and T4 — viruses that infect bacteria such as Escherichia coli — contain regions of repetitive DNA called contingency loci. These are mutational hotspots in which the DNA-copying machinery is particularly liable to slip while copying a run of repeated bases. It may insert or omit one of the repeats, changing the way the remainder of a gene is read and consequently altering the protein it produces.

Such replication errors occur in these regions thousands of times more frequently than mutations across the rest of the phage genome. Far from producing a population of genetically identical copies, therefore, phage replication continually generates a mixture of variants with different inherited characteristics.

The discovery arose from experiments involving a bacterial antiviral system called TgvAB, normally found in Vibrio cholerae, the bacterium that causes cholera. The researchers transferred the genes for this defence system into laboratory E. coli and exposed the bacteria to T2 phages. Although the defence initially restricted the phages, the viral population began overcoming it within hours.

Refuting Creationism - Rapid Evolution In Andean Potato Eaters

Andean Quechua speaker

By Cacophony - Own work, CC BY-SA 4.0, Link

Quechua woman and child in the Sacred Valley

By quinet - Mother and Child, CC BY 2.0, Link

Indigenous Andeans have a digestive superpower; researchers think it may be linked to potatoes  | UCLA

The results of a study co-led by researchers at UCLA and the University at Buffalo, published in Nature Communications in May 2026, provide another straightforward counterexample to the creationist claim that natural processes cannot add genetic material to a genome without the intervention of their particular magic creator. They also show how relatively recent human evolution can be detected, reconstructed and quantified from the DNA of living populations.

What cannot be observed is the intelligently designed caricature of evolution that creationists are conditioned to mistake for the scientific theory: a single dramatic event in which one species suddenly transforms into an unrelated form. There is no plausible biological mechanism for such a transformation, which is why evolutionary biologists have never proposed one. Biological evolution is a change in the frequency of heritable variants within a population over successive generations; larger differences, including those associated with speciation, accumulate through many such changes.

Young-Earth creationists are nevertheless prepared to invoke evolution at an absurdly accelerated rate when their mythology requires it. To squeeze the present diversity of life into the few millennia supposedly available after their genocidal global flood, a small number of vaguely defined ancestral “kinds” would have needed to diversify into hundreds of thousands of beetle species and countless other forms almost overnight. Yet the same creationists baulk at evidence that human populations have undergone much more modest evolutionary changes over thousands of years.

The new research concerns AMY1, the salivary amylase gene. Salivary amylase begins the digestion of starch in the mouth, and people differ considerably in the number of AMY1 copies they carry. An early duplication of the gene occurred in the hominin lineage at least 800,000 years ago, after which repeated duplications, deletions and inversions generated numerous structural variants containing different numbers of copies. These are mutations that change the amount and arrangement of genetic material in the genome — precisely the sort of naturally arising variation that creationists insist cannot occur.

Crucially, cultivating potatoes did not cause the ancestors of Indigenous Andeans to acquire additional AMY1 copies because they needed them. High-copy variants were already present in the population. When potatoes and other starch-rich crops became dietary staples, people carrying more copies probably produced more salivary amylase and obtained a reproductive or survival advantage. Natural selection then increased the frequency of those pre-existing variants — evolution acting as a filter, not as a designer working towards a predetermined goal.

The researchers analysed AMY1 copy numbers in 3,723 people representing 85 populations. Indigenous Peruvian Andeans had among the highest numbers found, with the Quechua participants carrying a median of ten copies, compared with six among the closely related Maya comparison group and seven across the worldwide sample. The genetic evidence indicates that a high-copy haplotype increased in frequency among Andeans from about 2 per cent to approximately 45 per cent after around 10,000 years ago, coinciding with permanent settlement of the high Andes and the domestication of potatoes between about 10,000 and 6,000 years ago.

Refuting Creationism - How Spiders Got Their Fangs - 518 Million Years Before 'Creation Week'

Artist’s impression of Urokodia.

Credit: Xiaodong Wang

UROKODIA! 518-million-year-old fossil shows beginning of spider’s bite | News | University of Leicester

The World Spider Catalog currently recognises more than 54,000 living species of spider, and tens of thousands more may remain undiscovered. Every one of them possesses a pair of specialised mouthparts called chelicerae, each of which terminates in a fang. In most spiders, these fangs inject venom, although a few lineages have lost their venom glands and subdue their prey by other means.

Chelicerae are not, however, unique to spiders. They are the defining appendages of the Chelicerata, the major arthropod group that also includes scorpions, mites, ticks, harvestmen and horseshoe crabs. Scorpions possess small, pincer-like chelicerae near the mouth; their conspicuous claws are modified pedipalps, while their venom is delivered through a sting at the end of the tail. In other chelicerates, the same basic pair of appendages has been modified into pincers, piercing mouthparts or other feeding structures.

This shared anatomy strongly suggests that chelicerae were inherited from a common ancestor and subsequently modified as the different chelicerate lineages evolved. But what did the ancestral appendage look like, and when did it first appear?

Such questions inevitably involve gaps in the fossil record—gaps that creationists routinely misrepresent as evidence against evolution. Their argument depends upon portraying evolutionary theory as little more than a story constructed from fossils and therefore requiring an unbroken succession of specimens linking every species to its ancestors. Evolutionary theory requires no such thing. Fossilisation is an exceptionally rare event, and evolutionary relationships are reconstructed from multiple independent lines of evidence, including comparative anatomy, embryology, genetics and the fossils that happen to have survived.

Nevertheless, creationists will be disappointed to learn that another important part of this particular gap has now been bridged. A paper published in Nature by a Chinese-British research team led by Yu Liu and Lorenzo Lustri of Yunnan University describes the remarkably preserved anatomy of Urokodia aequalis, a small marine arthropod recovered from the famous Chengjiang fossil site in Yunnan Province, southern China. The rock formation containing it dates from approximately 518 million years ago.

Creationism in Crisis - Speciation in Progress? - Genetic Isolation In A British Dolphin.

Risso's dolphin Grampus griseus.

Credit: Nicola Hodgins

Risso's dolphin, Grampus griseus

© Nicola Hodgins.

British Risso’s dolphins belong to single population - University of Exeter News

According to newly published research in the Journal of the Marine Biological Association of the United Kingdom (JMBA), Risso’s dolphins, Grampus griseus, around the British Isles appear to form a single, genetically connected population. At the same time, their mitochondrial DNA distinguishes them from dolphins sampled elsewhere in the Atlantic and Mediterranean, suggesting that the British population has experienced relatively little genetic exchange with more distant populations.

The research was conducted by an international team whose joint first authors were Nicola K. Hodgins, a visiting researcher at the University of Exeter, UK, and Ing Chen of National Taiwan Normal University, with Michael Krützen of the University of Zurich as corresponding author.

At first sight, describing the British dolphins as both a single population and genetically distinct might seem contradictory, but the two findings concern different geographical scales. Within British waters, the dolphins appear to interbreed freely enough to prevent significant regional genetic divisions from developing. Compared with populations farther afield, however, reduced gene flow has allowed the British population to acquire a distinctive genetic signature.

Creationism In Crisis - After Darwin's Finches It's Darwin's Daisies - Evolution In Progress

Serrated leaves of Scalesia affinis (radiate-headed scalesia)

Photo: Michael Martin, NTNU University Museum

Botany’s answer to Darwin’s finches shows evolution in real time

The Galápagos Islands occupy an iconic place in the history of evolutionary biology. The animals and plants Darwin encountered there during the voyage of HMS Beagle contributed important evidence to the theory he developed after returning to England: that living species are not fixed and immutable but are the products of a long historical process.

Darwin eventually realised that natural selection acting upon inherited variation could produce organisms that appeared designed for their environments, without foresight, planning or divine intervention. Individuals possessing variations that gave them an advantage in their particular circumstances tended to leave more descendants, causing those variations to become more common over successive generations.

Like the uniformitarian geologists—particularly Charles Lyell—Darwin recognised that the world as we see it is not a fixed unchangeable result of a single act of perfect creation, but is the product of natural processes operating over immense periods of time. The processes that shaped the past are still operating today and will continue to shape the future.

The familiar story that Darwin saw the Galápagos finches and immediately conceived his theory is, however, an oversimplification. During the voyage, he believed he had collected birds belonging to several different groups, including finches, grosbeaks, blackbirds, wrens and warblers. Only after the ornithologist John Gould examined the specimens in England did it become apparent that these apparently disparate birds belonged to a distinctive group of closely related species—what we now call Darwin’s finches, although taxonomically they are members of the tanager family.

Darwin then appreciated the evolutionary significance of their shared characteristics and striking differences. Their varied body sizes and beaks could be understood as modifications of a common ancestral form, associated with different diets and ecological niches throughout the archipelago. One ancestral population had diversified into numerous related forms: a process now known as adaptive radiation.

The standard creationist response is to dismiss Darwin’s finches as evidence for evolution because they remain recognisably finch-like. This objection depends upon the childish parody of evolution in which one species should turn suddenly into an entirely different and supposedly unrelated species. Such an event would not demonstrate evolution; it would contradict the branching process of descent with modification. Descendants necessarily remain related to their ancestors and inherit modified versions of ancestral structures.

This misconception lies behind such familiar creationist “Gotchas!” as “Why do we never see evolution happening?” and “Why has evolution stopped?” Evolution has not stopped. What creationists demand to see is not evolution but an instantaneous transformation that evolutionary biology neither predicts nor requires.

Darwin knew nothing of Mendelian genetics or DNA, of course. Modern genomic research has confirmed the common ancestry of his finches while revealing a history more complicated than a simple, neatly branching tree. Rapidly diverging lineages can retain genetic variants inherited from their common ancestor and can occasionally exchange genes through hybridisation.

Now, genomic research into a family of plants—the genus Scalesia, commonly known as the Galápagos giant daisies—has provided a botanical counterpart to Darwin’s finches. In only about one million years, the founding lineage has diversified into 15 recognised species occupying habitats ranging from dense, humid highland forests to hot, dry and exposed lowlands. They vary from low-growing shrubs to trees, with leaves ranging from large and unlobed to small, deeply lobed and intricately serrated.

Refuting Creationism - The Complex Origins of Modern Humans - No Just A Single Couple - Not Even A Single Species

Interwoven Human ancestry

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New technique pinpoints human DNA inherited from ‘ghost’ ancestors - Berkeley News

Using genealogical relationships in DNA, UC Berkeley researchers have uncovered hidden contributions from extinct human populations that left no sequenced genomes.

Meaghan Marohn

The evolutionary ancestry of modern Homo sapiens is far more complex than anything the authors of the Bible’s absurdly simplistic origin myths could have imagined. We already know that populations of our species migrating out of Africa interbred with Neanderthals and Denisovans, and that these two archaic lineages also exchanged genes with one another. Consequently, most people with ancestry outside Africa carry some Neanderthal DNA, while many Asian and especially Oceanian populations also carry Denisovan DNA.

Now, according to a paper just published in Science, our ancestry is even more complicated. A team led by researchers at the University of California, Berkeley, with colleagues at Johns Hopkins University and 54Gene, has identified genetic material inherited from two previously unknown archaic hominin lineages. These are described as “ghost” lineages because no sequenced genome from either population is available: their existence must be inferred from the traces they left in the genomes of living people.

The researchers developed a computational method called TRACE — TRacking Archaic Contributions via ARG Estimation — which reconstructs genealogical relationships among segments of DNA. By identifying regions whose ancestry extends unusually far back in time, TRACE can detect contributions from extinct populations without requiring DNA recovered from their bones.

Refuting Creationism - Ceremonial Rituals In An Australian Cave - 15,000 Years Before 'Creation Week'

GunaiKurnai grass-burning ritual, 25,000 years ago

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GunaiKurnai grass-burning ritual, 25,000 years ago, Cloggs Cave, Victoria, Australia.

AI-generated image (ChatGPT 5.6 Sol)

Microscopic plant remains reveal 25,000 years of GunaiKurnai rituals deep in a Victorian cave

A point I have made before in this blog is that the ignorance of the Bible’s authors is revealed as clearly by what they omitted as by what they included. When examined in the light of modern science, many of their claims turn out to be wrong, showing that they filled gaps in their knowledge with stories that reflected the prevailing superstitions of their culture. Meanwhile, the omissions reveal just how narrow their geographical and intellectual horizons were.

There is no unmistakable fact in the Bible that could not have been known, inferred or imagined by people living in the ancient Near East when its various books were written. There is no knowledge that required revelation from an omniscient being and no awareness of vast regions, peoples or periods of history lying beyond the experience of its human authors.

That is entirely understandable if the Bible is a collection of human writings. It is much more difficult to explain if its ultimate author was an omniscient god. Such an author would not have shared the cosmological limitations of ancient people or presented the world in the familiar ancient Near Eastern form found in Genesis: primordial waters divided by a firmament, dry land beneath it, and the Sun, Moon and stars placed in that firmament as lights. Whatever ingenious reinterpretations modern apologists may retrofit to the text, there is nothing in it that anticipates the real structure, age or scale of the Universe.

Nor is there any hint that people were already living on the other side of the planet. Archaeological evidence from Madjedbebe in northern Australia indicates human occupation by about 65,000 years ago. The Bible’s authors knew nothing of Australia, its First Peoples or the tens of thousands of years of human history that had already elapsed before the supposed events of Genesis.

What is perhaps more surprising is that educated adults today can still imagine that the Genesis creation myth is an accurate and inerrant account of history, despite its demonstrable errors and enormous omissions. The text contains no Australia, no Americas, no Pacific peoples and no conception of the deep human past—only the restricted world known to its authors, projected onto the entire planet.

Augustine of Hippo provides an illuminating example of how treating Scripture as historical fact could obstruct an otherwise rational consideration of the evidence. Contrary to a common misconception, Augustine did not insist that Earth was flat. By his time, its spherical shape had been understood by educated Greeks and Romans for centuries, and Augustine was prepared to concede that it might be demonstrated scientifically.

What he could not accept was that the far side of a spherical Earth might be inhabited, because that appeared irreconcilable with the biblical claim that every human descended from a single original man—and, after the supposed global flood, from Noah and his family. In De Civitate Dei, he wrote:

How Snakes Lost Their Legs - 80 Million Years Before 'Creation Week'

fossil of Tametara mirim

Agustin Martinelli

80-million-year-old snake fossil sheds light on why lizards lost their limbs and started slithering

Of all the primitive ‘just-so’ stories in Genesis, the tale of how the serpent was condemned to crawl on its belly must rank among the most transparently mythological. Having supposedly tempted Eve to eat the forbidden fruit, God curses the serpent to go on its belly and ‘eat dust’ for the rest of its life. Although the story never explicitly says that the serpent previously had legs, the curse plainly implies a change and has traditionally been understood as an explanation for why snakes slither instead of walking.

Like so much of Genesis, it begins with an observation familiar to its authors—snakes have no legs—and invents a magical tale to explain it. It is an ancient example of an etiological myth: folklore devised to explain why something in the natural world appears as it does, long before anyone had the evidence or intellectual framework needed to understand its real history.

Even as mythology, however, the story is strangely incoherent. Genesis itself does not identify the serpent as Satan but introduces it as the most cunning of the wild animals God had made. Nevertheless, this supposedly ordinary animal can speak, reason and somehow knows about a prohibition that God had given to Adam before Eve had even been created. The text makes no attempt to explain how it acquired either this knowledge or the power of speech.

More awkward still for anyone insisting that the story is literally true, the serpent’s predictions prove substantially more accurate than God’s warning. God tells Adam that he will die on the day he eats the fruit. The serpent tells Eve that they will not die, that their eyes will be opened and that they will become like God, knowing good and evil. They eat the fruit, their eyes are opened and they do not die that day. God then confirms that the humans have indeed become ‘like one of us’ in knowing good and evil. According to Genesis itself, Adam goes on to live for another 930 years.

On the most straightforward reading of the story, therefore, the serpent tells Eve the truth while God’s threat to Adam proves false. Later theologians have attempted to rescue the tale by inventing a ‘spiritual death’, or by claiming that Adam merely began to die that day, but neither qualification appears in the text. These are apologetic repairs added by people who can see the problem but cannot admit that the story’s authors created it.

Science, meanwhile, has uncovered a very different account of how snakes acquired their extraordinary bodies—one involving neither talking reptiles nor fruit, curses or human disobedience, but descent with modification over immense periods of geological time. Snakes are highly modified members of the squamate reptile radiation. Their ancestors progressively elongated their bodies, increased the number of vertebrae and reduced their limbs as different lineages adapted to particular ways of life. Their evolutionary history extends back at least to the Middle Jurassic, about 160 million years ago.

Now, a paper published in Nature by an international team led by Tiago R. Simões describes an exceptionally well-preserved early snake from the Late Cretaceous of Brazil. Named Tametara mirim, the animal lived approximately 85–75 million years ago, when non-avian dinosaurs still dominated terrestrial ecosystems. It is the first articulated snake fossil known from Brazil and preserves a three-dimensional skull together with more than 100 connected vertebrae.

The preserved portion of its skeleton appears to have lacked forelimbs. Because the region around the pelvis is missing, the researchers cannot determine whether it retained vestigial hindlimbs, as some other early snakes did. Its skull also combines recognisably snake-like specialisations with ancestral features resembling those of other squamate reptiles—precisely the sort of mosaic of old and new characteristics expected in an evolving lineage, but not from the instantaneous transformation of an animal by a divine curse.

Refuting Creationism - The Unbroken History of China

Carving stone at Shimao city.

Image by IVPP.

The landscape of Shimao city.

Image by IVPP.

New DNA Study Unlocks Origins, Social Structure of Neolithic Shimao Civilization----Chinese Academy of Sciences

In my last blog post, I pointed out that ancient Egypt’s archaeological and written record extends continuously from long before the date young-Earth creationists assign to Noah’s Flood, through that supposed catastrophe and into biblical times. Nowhere is there any sign that Egypt was destroyed by a global flood and subsequently repopulated by migrants from Mesopotamia. I also showed that the biblical writers who set stories in Egypt possessed only a tenuous understanding of its real history and culture.

Ancient China presents creationists with much the same problem. Its archaeological record contains long regional sequences extending across the supposed date of the Flood, with local populations, cultures and economies continuing to develop. If every human outside Noah’s immediate family had been exterminated, the existing peoples of East Asia should disappear from the record and be replaced by a rapidly expanding population of recent Mesopotamian origin. That is not what archaeology shows—and ancient DNA now provides an especially clear test of the claim.

The evidence comes from a paper published in Nature in November 2025 by an international team led by Professor Qiaomei Fu of the Institute of Vertebrate Paleontology and Paleoanthropology (IVPP) at the Chinese Academy of Sciences, working with researchers from several other Chinese institutions.

The team analysed genome-wide data from 169 ancient individuals recovered from Shimao and surrounding settlements in northern China. Population analyses were conducted using 144 unrelated individuals, while the remaining close relatives enabled the researchers to reconstruct pedigrees extending across as many as four generations.

Shimao, in northern Shaanxi Province, was one of the largest fortified settlements in Late Neolithic China. Occupied from approximately 2300 to 1800 BCE, it covered about four square kilometres and contained massive stone walls, separate inner and outer enclosures, specialised craft production, elite cemeteries and unmistakable evidence of a highly stratified society. Its occupation therefore began at about the very time when, according to the conventional young-Earth creationist chronology, the world should have been struggling to recover from a global extermination and repopulation by Noah’s immediate descendants.

Instead, the genomes showed that the people associated with Shimao were predominantly descended from populations already living in northern Shaanxi at least 1,000 years earlier. Those earlier inhabitants were associated with the Yangshao cultural tradition of the Yellow River’s Loess Plateau. The researchers found regional genetic continuity from the Middle to the Late Neolithic—continuity extending from before the supposed Flood into the centuries following it.

This was not a completely isolated or genetically static population. The researchers detected continuing contact with Yumin-related people from Inner Mongolia, close connections with the contemporary Taosi population farther south, and some ancestry from southern East Asian populations, possibly associated with the northward spread of rice cultivation. These were the ordinary movements, exchanges and intermarriages expected among neighbouring prehistoric farming and pastoral communities. They did not interrupt the dominant local ancestry, and there was no sign of wholesale population replacement by descendants of a family recently arrived from Mesopotamia.

The genetic evidence also revealed much about the organisation of Shimao society. Pedigrees reconstructed from elite burials indicated a predominantly patrilineal system in which status and wealth commonly passed from high-ranking men to their sons. Male members of these lineages showed relatively little diversity in their Y-chromosome ancestry, whereas the women displayed much greater mitochondrial diversity. This is consistent with women frequently marrying into communities dominated by established male lineages, although the evidence for strictly patrilocal residence remains suggestive rather than conclusive.

The study also uncovered a possible sex-related pattern in Shimao’s practice of human sacrifice. Nine of the ten sampled victims buried beneath the East Gate were male, contradicting earlier identifications based on skeletal anatomy. In contrast, most sampled sacrificial victims accompanying elite burials were female: six of seven at Hanjiagedan and fourteen of nineteen at Huangchengtai. This suggests that male and female victims may have been selected for different rituals conducted in different places, although the researchers caution that the number of genetically sexed victims remains too small to establish the pattern conclusively.

Creationism Refuted - How The Building Blocks Of Life Can be Made Without Magic

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Cosmic dust analogue seen through a microscope created by experiment by Linda Losurdo.

This student made cosmic dust in her lab. What she found could help us understand how life started on Earth - The University of Sydney

Creationist objections to abiogenesis often smuggle in the long-discredited idea of vitalism: the belief that living matter contains some special ingredient or “vital force” absent from non-living matter. This appears to lie behind the familiar creationist refrain that “life cannot come from non-life”, as though “life” were a substance that must be added to matter by a supernatural agent.

The word “life”, however, is rarely defined in this argument. Scientists can devise operational definitions for particular purposes, but life is not a single substance possessed by some molecules and absent from others. It is a collection of properties displayed by sufficiently organised chemical systems. By leaving the term undefined, creationists turn their assertion into a slogan that can neither be tested nor falsified.

The distinction between organic and inorganic chemistry is useful, but partly conventional and historical. Organic chemistry deals broadly with carbon compounds, although some carbon-containing substances—including carbon dioxide, carbon monoxide and carbonates—are traditionally classified as inorganic. There is no fundamental physical boundary between the two categories: both obey precisely the same laws of physics, chemistry and quantum mechanics.

Carbon’s extraordinary chemical versatility follows from its atomic structure. A carbon atom has six protons and six electrons, four of which are valence electrons in its outer shell. Its small size and ability to form strong covalent bonds with itself and with elements such as hydrogen, oxygen and nitrogen allow it to form stable chains, rings, branches and extensive molecular networks. Depending on how it is bonded, carbon can adopt tetrahedral, trigonal-planar or linear arrangements and can form single, double or triple bonds. All this follows from quantum chemistry; no vital spark, magical ingredient or special rule is required.

None of that proves that the origin of life was inevitable, and science does not yet possess a complete account of every stage of abiogenesis. What it does show is that there is no known chemical or physical barrier preventing non-living chemistry from becoming progressively more complex. Under suitable conditions, chemical systems can acquire such properties as compartmentalisation, catalysis and molecular replication. Once populations of replicating systems existed with heritable variation, natural selection could favour those that survived longer, reproduced more reliably and used available resources more efficiently.

One important question is where the organic raw materials involved in this prebiotic chemistry came from. Some could have formed on the early Earth, but organic compounds are also widespread throughout the Solar System and interstellar space. They have been detected in comets and asteroids and regularly occur in meteorites. Earth may therefore have received substantial quantities of organic material from several extraterrestrial sources. This raises another scientific question: what natural chemical and physical processes produced and modified that material in space?

Linda Losurdo, a PhD candidate in materials and plasma physics in the School of Physics at the University of Sydney, Australia, has investigated part of that question with her supervisor, Professor David McKenzie. They recreated some of the energetic, near-vacuum conditions associated with stars and other astrophysical environments inside glass tubes. After evacuating the tubes, they introduced nitrogen, carbon dioxide and acetylene and subjected the mixture to an electrical potential of about 10,000 volts for approximately an hour, producing a plasma known as a glow discharge.