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Which describes oxygen content as Earth evolved over time?
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Which describes oxygen content as Earth evolved over time?

User Lukas Bach
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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.

Step-by-step explanation:

User Hugerde
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Answer: Oxygen levels sharply declined about 400 million years ago

Explanation: corect answer

User Majid Lotfinia
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