AP Biologymediummcq1 pt
Which pair of processes directly releases carbon dioxide to the atmosphere?
A.Photosynthesis and carbon fixation
B.Nitrogen fixation and nitrification
C.DNA replication and translation
D.Cellular respiration and combustion
Explanation
Core Concept
Cellular respiration releases CO2 as organisms oxidize organic carbon, and combustion releases CO2 when carbon-containing fuels or biomass burn. Photosynthesis and carbon fixation instead remove CO2 from the environment. The wording avoids claiming that any one pair accounts for every important global atmospheric carbon flux.
Correct Answer
DCellular respiration and combustion
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