During the _____ period, jawless fishes were the first vertebrates to leave fossil evidence.

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asked Aug 15, 2018 148k views

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Chris Hawes · Answer 1 · 2018-08-20T20:49:25+0000

During the Ordovician period, jawless fishes were the first vertebrates to leave fossil evidence.
Ordovician period lasted for almost 45 million years, during which most of the world was under an ocean.

During the _____ period, jawless fishes were the first vertebrates to leave fossil evidence.

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