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This Concept Map has information related to: Ch. 20, Origin and Evolutionary History of Life Ch. 20 required Chemical Evolution, 4) cells oldest were heterotrophs, Chemical Evolution steps 1) molecules spontaneously form and accumulate, Paleozoic 3 eras post pre-cambrian cenozoic, Chemical Evolution must have energy, cenozoic periods quaternary, ocean floor with hydrothermal vents, jurassic prominant reptiles, tertiary epochs oligocene, mass extinction possibly asteroid collision