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Q.

Before ______________, Earth’s atmosphere consisted of water vapor, methane, ammonia, and other gases, but not oxygen. 

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a

After photosynthesis 

b

Before photosynthesis evolution 

c

Initial stages of photosynthesis evolution 

d

Present times 

answer is B.

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Detailed Solution

Before photosynthesis evolved, Earth’s atmosphere consisted of water vapor, methane, ammonia, and other gases, but not oxygen. 

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