What Is the Main Reason Why Atmospheric Oxygen Levels Did

question 2

Multiple Choice

What is the main reason why atmospheric oxygen levels did not rise immediately after the mass production of the gas by photosynthetic bacteria?

• A) Because oxygen was rapidly consumed by aerobic microorganisms.
• B) Because oxygen was dissolved in water.
• C) Because large amounts of ferrous ions reduced the oxygen molecules.
• D) Because oxygen was rapidly recycled by early photosynthetic bacteria.

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