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Answer Key Chapter 26 Timeline “Precambrian:” Archean: Protobionts Stromatolites (3.5bya) – first prokaryotes Oldest Fossils Bacteria in Rocks ATP/ETC (3bya) Prokaryotes Diversify Autotrophs Chemo/heterotrophs Cynaobacteria (2.7bya) Proterozoic (2.5) Paleozoic Oxygen Revolution (2.2bya) Endosymbiosis Eukaryotes (2.1bya) Genetic Annealing, Plastids endosymbiosis Mitochondria / Chloroplasts Alpha proteobacteria Multicellular (fossils 1.2bya) Snowball earth (600mya) Colonies Phanerozoic Paleozoic (600mya) Specialization Cambrian Explosion Terrestrial Bacteria (500mya) Mesozoic (250mya) Pangea (250mya) Continental Drift Permian Mass Extinction (250mya) Flowering Plants Cretaceous Mass Extinction (65mya) Cenozoic (65mya) Primates Humans.