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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