Biological evolution is the heritable change in characteristics of biological populations over successive generations, driven by mechanisms such as mutation, recombination, genetic drift, gene flow, and natural and sexual selection. It operates through changes in allele frequencies within gene pools, constrained and shaped by developmental, physiological, and ecological contexts. Evolutionary processes generate adaptation, diversification, and extinction, producing hierarchical patterns from microevolutionary shifts within populations to macroevolutionary dynamics among lineages. At the molecular level, evolution involves sequence variation, genomic rearrangements, and changes in gene regulation, which collectively underlie phenotypic diversity and the emergence of complex biological organization.
Certain species of wasps and frogs share a pain and inflammation peptide similar to one found in vertebrates to help defend against predators—a discovery that contributes to a shifting view of how evolution works, say researchers. ...
Plants & Animals
Mar 5, 2026
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84
When a species lives in two distinct types of habitats, individuals with traits better suited to each habitat will thrive and reproduce, naturally selecting descendants with those traits. But what about mobile aquatic species ...
Evolution
Mar 5, 2026
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18
Woodpeckers are well known for striking tree trunks with remarkable force and precision. These birds deliver thousands of high-speed impacts per day, generating mechanical loads that would destabilize the skulls of most other ...
Plants & Animals
Mar 5, 2026
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104
All complex biological systems—like the DNA, RNA and proteins constantly being copied and built within our cells—are prone to errors. That means as life evolved to be more elaborate, it also had to evolve error-correcting ...
Evolution
Mar 5, 2026
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16
Paleobiologist Geerat Vermeij is enthralled with mollusks. Their shells line the surfaces and fill the cabinets and drawers in his office on the second floor of the Earth and Planetary Sciences Building at UC Davis. But Vermeij's ...
Plants & Animals
Mar 4, 2026
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12
Walking on two legs has long been considered a milestone in human evolution and one of our most defining characteristics. Until now, researchers assumed that the first humans originated in Africa and that bipedalism developed ...
Evolution
Mar 4, 2026
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159
When a new species is discovered, it's tempting to imagine an adventure novel, said Chan Kin Onn of Michigan State University. "Most people have this image of an intrepid explorer braving an isolated mountain or some other ...
Plants & Animals
Mar 3, 2026
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227
A research group led by Associate Professor Tetsuya Muramoto from the Faculty of Science, Toho University, has established a CRISPR genome editing technique that enables comparative analysis of the evolution of multicellularity ...
Cell & Microbiology
Mar 3, 2026
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8
Plants are fast-tracking their own evolution by "plugging in" genetic code stolen from their neighbors, according to new research that reveals the secret to their own successful genetic engineering. The study, led by Catherine ...
Evolution
Mar 2, 2026
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15
Early mammalian ancestors were nocturnal, sleeping during the day while the dinosaurs dominated the land. However, some mammalian lineages, including human ancestors, independently transitioned to diurnality (active during ...
Evolution
Feb 27, 2026
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63
