Multiple Choice
When scientists discuss the great oxygenation event, they are referring to a time when
A) carbon dioxide began to accumulate in the atmosphere at more than trace quantities.
B) free oxygen began to diminish in the atmosphere.
C) free nitrogen began to diminish in the atmosphere.
D) free oxygen began to accumulate in the atmosphere at more than trace quantities.
Correct Answer:
Verified
Correct Answer:
Verified
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