Evidence for evolution comes from several sources.
- Fossils provide evidence of evolution - fossils in older layers are more primitive than newer layers
- Geography can provide evidence - island species most closely resemble the nearest mainland species, and populations can show variation on different islands
- Embryology provides evidence - crabs and barnacles have identical larvae - but different adult bodies
- Anatomy can provide evidence - different species can have homologous structures - that have different functions, sometimes different species can have analogous structures - that have similar functions, vestigial structures also are evidence of evolution - structures that had a function in an early ancestor
Watch the Teacher's Pet video, Evidence of Evolution before moving on.