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This Concept Map has information related to: Seth Sobottka Chapter 20, Protobionts form from Macromolecules #4 Cells arise from Macromolecules, Paleozoic Era #3 Mesozoic Era, Organic Molecules Form #2 Macromolecules Assemble from Molecules, Precambrian Time #2 Paleozoic Era, Cells First were Prokaryotic Heterotrophs, Four Requirements #1 The Absence of Oxygen, Energy to Form Molecules #3 Chemical Building Blocks, Chemical Evolution There are Four Steps, Chapter 20: The Origin and Evolutionary History of Life ???? 3 Eras of World History, Aerobes Followed by Eukaryotes