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The top documents tagged [reptilespermian period]
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reptilespermian period
Vertebrate Characteristics Kingdom Animalia; Phylum Chordata; Subphylum Vertebrata.
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Paleozoic Era 570,000,000 years ago to 225,000,000 years ago Life starts in the seas and moves onto land Six periods: Cambrian Ordovician Silurian Devonian.
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