CARMALT - 4 Eras of Earth's existance
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| 4.5 billion years agoliving things were one-celled organisms | Precambrian Era
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| 600 million years agofossile recrods of hard-shell animals | Cambrian Period (Paleozoic Era)
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| 510 million years agoanimal life in the oceans | Ordovician Period (Paleozoic Era)
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| 439 million years agofirst land plants evolve, reefs build up | Silurian Period (Paleozoic Era)
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| 408 million years agoland plants and amphibians evolve | Devonian Period (Paleozoic Era)
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| 360 million years agoamphibians and reptiles evolve | Carboniferous Period (Paleozoic Era)
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| 290 million years agocone-bearing plants and reptiles evolve | Permian Period (Paleozoic Era)
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| 245 million years agomammals present | Triassic Period (Mesozoic Era)
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| 208 million years agodinosaurs present | Jurassic Period (Mesozoic Era)
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| 144 million years agomore different dinosaurs appear than during Jurassic Period | Cretaceous Period (Mesozoic Era)
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| 65 million years agoapes and humanoids | Tertiary Period (Cenozoic Era)
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| 1.6 million years ago to TODAY!humans | Quaternary Period (Cenozoic Era)
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EM4CARMALT
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