Biologists Are Fairly Certain That Oxygen Was Built Up in the Atmosphere

question 2

Multiple Choice

Biologists are fairly certain that oxygen was built up in the atmosphere by the development of photosynthesis. The production of oxygen and, therefore, the beginning of extensive aerobic life was made possible by the evolution of

• A) fermentation.
• B) photosystem I.
• C) photosystem II.
• D) glycolysis.
• E) the nucleus.

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