The Transition of the Early Earth's Atmosphere from One Rich

question 5

Multiple Choice

The transition of the early earth's atmosphere from one rich in hydrogen to one rich in oxygen may be attributed to

• A)photosystem II.
• B)photosystem I.
• C)the cyclic pathway of photosynthesis.
• D)the light-independent reactions.
• E)the activity of the electron transfer chain.

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