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For the First 1 Billion Years of Earth's Evolution, the Fraction

Question 83

Multiple Choice

For the first 1 billion years of Earth's evolution, the fraction of oxygen in its atmosphere was approximately

A) zero.
B) half of what it is today.
C) 2 times what it is today.
D) 10 times what it is today.
E) the same as it is today.

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