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10 February, 10:07

Which describes oxygen content as Earth evolved over time?

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  1. 10 February, 10:50
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    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.
  2. 10 February, 14:04
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    Answer: Oxygen levels sharply declined about 400 million years ago

    Explanation: corect answer
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