Multiple Choice
Approximately how long after the Solar System formed did it take for oxygen to get to within 80 percent of its present abundance in Earth's atmosphere?
A) 4 billion years
B) 1 billion years
C) 400 million years
D) 1 million years
E) Oxygen was always a primary component of Earth's atmosphere.
Correct Answer:
Verified
Correct Answer:
Verified
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