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OpenStudy (anonymous):
Discuss the evolution of the first living cells and how it affected the amount of each of these gases present in the atmosphere.
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OpenStudy (anonymous):
https://www.mtholyoke.edu/courses/diakelly/150/cells.pdf check out this PDF ... is really good.... it will not help you with 100% of your question, but it will give you some good knowledge to develop a great answer for your question :D
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