Give examples of homologues and rudiments.

Common examples of homologous structures in evolutionary biology are the wings of bats and the arms of primates. Evolutionary theory explains the existence of homologous structures, adapted to different purposes, as a result of descent with modification from a common ancestor.

A rudiment is an imperfectly developed form of an organ that only appears as a rough sketch or footprints. In walrus and cetaceans, the fingers that form them are no longer distinguishable in the legs: these are real fins, walruses and manatees have rudiments or remains that indicate the discovered five fingers. These are the rudiments.