A new study theorizes that evolution ticks at different speeds, especially when a big group of organisms first appears.

The oldest fossilized remains of complex animals appear suddenly in the fossil record, and as if from nowhere, in rocks that ...

Charles Darwin worried that the fossil record looked strangely abrupt, with complex animals appearing in a geological instant ...

Molecular evolution investigates the processes that drive changes in genetic material over time. It encompasses the generation of mutations—whether through DNA replication errors, damage or other ...