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Evolution has left much evidence Ch. 14.2 The Fossil Record • We use the past to help gather information about our present • FOSSILS – Found in _________ _______ • In sedimentary rock, younger rock is found near the top layers, older rocks near the bottom – LAW OF SUPERPOSITION • FOSSIL RECORD • Fossils of ancestral life forms link the past and the present – i.e. whales evolving from land dwelling ancestors that had 4 limbs Geographic Distribution • Geographical distribution of organisms serve as a clue to how modern species may have evolved Similarities in Structure • Certain structural similarities provide clues to evolutionary history – i.e. forelimbs of all mammals have same skeletal parts • however, __________ differs! • HOMOLOGOUS STRUCTURES • Evolution is a _________ process • VESTIGIAL STRUCTURES Similarities in Development • Embryos of closely related organisms have similar stages in development – i.e. all vertebrates __________________ Molecular Biology • Comparing DNA sequences to relate to species • Closer related have similar DNA, more differences in DNA show they don’t share a common ancestry
