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1st rock
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1st plant
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1st organism
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1st vertebrates
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Rodinia forms
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1st fish
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1st reptiles
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1st cockroach
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1st amphibians
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1st winged insects
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first dinosaurs
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1st birds
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Rodinia breaks apart
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dinosaur extinction
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1st mammal
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renaissance period
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America discovered
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revolutionary war
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constitution signed
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WWI
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1st automobile
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WWII
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1st atomic bomb
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1st airplane
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1st computer