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13 Cards in this Set
- Front
- Back
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The first fossils appeared during what Eon?
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Archean
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The first Eukaryotic organisms appeared during which Eon?
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Proterozoic
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The first multicellular organisms appeared during which Eon?
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Proterozoic
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The first animals appeared during which Eon?
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Proterozoic
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The first chordates appeared during which period?
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Cambrian
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The first vertebrates appeared during which period?
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Cambrian
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The first jawed vertebrates appeared during which period?
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Ordovician
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The radiation of jawed vertebrates happened during which period?
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Silurian
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The first tetrapod appeared during which period?
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Devonian
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The first amniotes (vert with hard shelled eggs) appeared during which period?
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Carboniferous
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The first diapsid reptiles appeared during which period?
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Carboniferous
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The first archosaurus appeared during which period?
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Triassic
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The first dinosaurs appeared during which period?
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Triassic
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