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Throwback Question: Scientists theorize that it took a billion years or more for oxygen in the atmosphere to reach the levels of today. Based on this idea, the first cells could be classified as which
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Throwback Question: Scientists theorize that it took a billion years or more for oxygen in the atmosphere to reach the levels of today. Based on this idea, the first cells could be classified as which of the following?

1 point
aerobic
anaerobic
eukaryotic
protista

User Uttam Sinha
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1 Answer

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Answer:

anaerobic i think

Step-by-step explanation:

User Nannette
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