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Biology 7 Online
OpenStudy (anonymous):

Please Help Medal And Fan ! (: the amount of CO2 in the atmosphere cycles in response to what ?

OpenStudy (anonymous):

Usually human activities. human produce 3-6% of all CO2 emissions by fossil fuels; most carbon is produced naturally, but this type of carbon removes CO2 in the air. The imbalance in the atmosphere is caused by human activites.

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