On which part of the carbon cycle have humans had the greatest impact?
A. return of CO2 to the atmosphere by
oxidation of ancient organic matter
B. capture of atmospheric CO2 by chemical
weathering of rocks
C. storage of CO2 through biomineralization
in the oceans
D. deposition of organic carbon in deep sea
sediments
E. All of the answer options have been
greatly impacted by humans.
A
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