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20 January, 21:06

Which describes oxygen content as Earth evolved over time?

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  1. 20 January, 21:07
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    Answer: Oxygen levels sharply declined about 400 million years ago

    Explanation: corect answer
  2. 20 January, 21:15
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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.
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