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(Solved): ~~11. The earth's early atmosphere did not contain oxygen gas...

~~11. The earth's early atmosphere did not contain oxygen gas. This changed dramatically once the early cells underwent photosynthesis.

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~~11. The earth's early atmosphere did not contain oxygen gas. This changed dramatically once the early cells underwent photosynthesis.

a. Given that the early atmosphere did not contain oxygen gas, explain how photosynthesis was able to occur in this type of early atmosphere. (5 points)

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