Which of the following statements explains how an oxygen-rich atmosphere was possible?
A) The number of plants has always outnumbered the animals.
B) Photosynthetic organisms have existed on earth longer than heterotrophs.
C) Rates of carbon fixation and respiration have always been equal.
D) Rates of oxygen consumption were lower than rates of photosynthesis.
E) All of these choices are correct.
Correct Answer:
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