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This Concept Map has information related to: Chapter 20, nonliving matter creates Life, 3 era's ???? Plaeozoic Era, Six periods ???? Ordovician, Chapter 20 the origin and evolutionary history of life in this chapter Chemical evolution, Six periods ???? Cambrian, Three Periods ???? Triassic, Cells ???? Aerobes, Mesozoic Era has Two Periods, Cells are found in Oldest fossils, needs chemical building blocks ???? Gasses