Concept:Comparative anatomy uses homologous structures, such as the pentadactyl limb, to show evolutionary relationships.Explanation:The pentadactyl limb is a five-fingered limb pattern found in many vertebrates.This similar bone arrangement in different animals, like humans, whales, and bats, points to a common ancestor.Therefore, the study of comparative anatomy for evolution is based on the presence of this five-fingered structure.
