Pre-Cambrian: First life on earth, 1st eukaryotic cells, 1st multicellular organisms, 1st photosynthesizing organism, Paleozoic: Cambrian explosion, land plants appear, ends with Permian extinction (90% of marine life and 70% of life on land wiped out), Mesozoic: Age of dinosaurs, Mammals appear, Great diversity of reptiles, End with Cretaceous extinction of dinosaurs, Cenozoic: Age of mammals, First human appears,

Evolution: Geologic Time Scale and Major Events

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