Explore the evidence for evolution: anatomy, molecular biology, biogeography, fossils, & direct observation.

These pages are part of a site called "Evolution," that accompanies a textbook by the same name. Mark Ridley is the author, and in this section he discusses the evidence for evolution.

Learn about the evolution of life in the Paleozoic Era based on fossil evidence of the five classes of fishes. Read about the role these chordates played in the evolution of tetrapods.