racysophil6leSpo racysophil6leSpo

01-11-2016
Biology

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The atmosphere of early earth probably contained no o2 until the emergence of organisms that _____.

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antonsandiego antonsandiego

02-11-2016

I am pretty sure that the atmosphere of early earth probably contained no o2 until the emergence of organisms that used water as an electron source for photosynthesis. If there were options to choose, I hope you have the same in your list, but I assume information I gave you is correct.

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