During the first major divergence of life, the atmosphere was ____

a. high in oxygen, high in carbon dioxide
b. high in hydrogen, low in oxygen
c. changing from anaerobic to aerobic
d. firmly in the age of aerobes
e. high in oxygen, low in carbon dioxide


ANSWER: b

Biology & Microbiology

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it will most likely lead to ____ in the immediate future.

a. new variations b. new species c. gene frequencies d. competition e. reproductive isolation

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What will be an ideal response?

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