Which describes oxygen content as Earth evolved over time?

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asked Nov 7, 2021 62.6k views

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Hugerde · Answer 1 · 2021-11-07T17:15:59+0000

Answer:

Oxygen levels sharply declined about 400 million years ago. Oxygen levels stay above 15 percent starting 200 million years ago Oxygen levels remain below 5 percent starting 1000 million years ago. Oxygen levels raise significantly between 1000 and 700 million years ago.

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Which describes oxygen content as Earth evolved over time?

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