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23-01-2017
Biology

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

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Greenleafable Greenleafable

31-01-2017

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.

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