Biogeography - a scientist is studying the distribution of extinct and modern ferns in North America., Structural Homology - Whales, bats and birds have the same bone that connects their limbs to the middle of their bodies., Homologous Molecules - Humans and chimpanzees share some DNA and protein sequences., Embryology - Chicken, pig, and fish embryos all have the pharyngeal folds., Common Ancestor - A predecessor that a creature shares with another creature., Radioactive Dating - Used to determine the age of fossils., Fossils - A preserved piece of excrement or a footprint from 10 thousand years ago. , Vestigial Structures - Humans' appendix and wisdom teeth no longer have a function yet are still present in the body.,

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