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Formation of earth (inabitant)
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earth become abitable spontaneos generation of first cells
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simple multicellular sea creatures develop
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sudden explotion of life
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trilobites abundant; some vertebrates
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land colonized by arthropods and plants
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first amphibians; freshwatere fish
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famphibians spread; sharks and bony fish
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giant insects; first reptiles
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modern insect; reptiles spread;evergreens
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first dinosaurs;rise of mamal
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giant dinosaurs; early birds
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mass extinctiions(including dinosaurs)flowering plants appear
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early mammals became dominant
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primitive apes; whales; first modern mammals
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peak of mammals; modern invertebrates
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ice age(s); mass estinctions; rise of human
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end of ice age; rise of human civilization
