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Published byClaud Morgan Modified over 9 years ago
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Shows gradual change over time Simpler = older and deeper in the rocks
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Give an actual glimpse of the past Direct evidence as to what existed before history of incremental development from one species to another Evidence for common descent & common ancestry
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The remains of a dead organism, usually found in rocks Can be bones,casts, footprints, burrows, or whole bodies trapped in amber (insects trapped in fossilized tree sap When formed in rock, minerals fill the pores and crystallize Hard tissues fossilize better than soft
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Similar sequences indicate how closely related organisms are to one another
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Cytochrome c, a protein needed for cellular respiration, is found in all living things Number of DNA base differences out of about 300
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Similar structures with different functions Suggest common ancestry
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Structures that exist but appear to have no function Suggest common ancestor with functioning versions of those structures
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Similar looking embryos suggest common ancestry
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Similar behaviors suggest common ancestry Ex. Head movements of all waterfowl
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Forces organisms to adapt, or go extinct Explains why you find fossils of sea creatures in a place that’s now a prairie http://www.cbc.ca/news/canada/ manitoba/story/2010/07/16/mb- ancient-fish-fossil-manitoba.html http://www.huffingtonpost.ca/2011/07/19/ mosasaur-fossils-found-in_n_903792.html
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The existence of similar species on separate continents supports continental drift theory AKA Paleogeography
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