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What happened around 500 million years ago?

What happened around 500 million years ago?
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5 votes
What happened around 500 million years ago?

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User Reza Sam
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2 Answers

2 votes
510 million years ago was the Cambrian Explosion occurred, when all animal phyla appeared in fossil record.
answered
User Prakash Karena
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7.6k points
6 votes
i was told plankton made the earths atmosphere breathable but probs wrong
answered
User Bruno Ribeiro
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8.8k points
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