Common Ancestor, A shared relative of two different species, either way back or recent, Homologous Structures, Similar body parts in different species inherited from a common ancestor., Comparative Anatomy, Study of the body structures of different species of animals in order to understand the adaptive changes they have undergone in the course of evolution from common ancestors., Analogous, Similar body parts because of use, and not because of common ancestry., Pangaea, Supercontinent -- all the lands together, Fossil, Remains of an animal or plant, Extinction, When a species is wiped out, What does an evolutionary tree show?, Common ancestors and homologous traits, What bone structure do mammals (and many other species) share?, One bone, two bones, many bones, FINGERS!, What happens to age of fossils as you dig deeper into rock layers?, They get older, Are fossils in the top rock layers younger or older than the ones below them?, Younger!, How long have humans inhabited earth?, Not that long. .

Fossils & Evolution!

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