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Together, respiration and photosynthesis keep the levels of carbon dioxide and oxygen in the atmosphere A. fairly constant. B. constantly changing. C.
constantly increasing. D. constantly decreasing
C. constantly increasing.
Expert answered|badgerpoe|Points 330|
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Asked 6/29/2011 1:44:45 AM
Updated 6/29/2011 2:02:13 AM
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C. constantly increasing is a right.
Added 6/29/2011 2:02:13 AM
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