The early atmosphere of Earth had much less oxygen than today. How has Earth's oxygen abundance increased over Earth's history?
A) Plant life generated oxygen through photosynthesis.
B) Volcanic eruptions release large amounts of oxygen.
C) Ultraviolet light breaks up ozone into oxygen.
D) Cometary impacts over Earth's history have contributed oxygen to the atmosphere.
E) None of these choices are correct.
Correct Answer:
Verified
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