kayathomas21777 kayathomas21777

07-09-2018
Biology

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what happened around 500 million years ago?

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leah0404 leah0404

07-09-2018

i was told plankton made the earths atmosphere breathable but probs wrong

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McKenzie34 McKenzie34

07-09-2018

510 million years ago was the Cambrian Explosion occurred, when all animal phyla appeared in fossil record.

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