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20. Most of today’s organisms could not have lived on Earth 3.6 billion years ago because there was no _____ in the air then.

20. Most of today’s organisms could not have lived on Earth 3.6 billion years ago because there was no _____ in the air then.
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20. Most of today’s organisms could not have lived on Earth 3.6 billion years ago because there was no _____ in the air then.

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User Buksy
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oxygen, mostly bacteria and they ran on glycolosis
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User Mathter
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