AP BIOLOGY

Detailed explanation-1: -Transpiration does not increase carbon dioxide in the air.

Detailed explanation-2: -So, the correct option is “D” (Photosynthesis).

Detailed explanation-3: -The Process of photosynthesis takes up Carbon dioxide and release oxygen. Hence photosynthesis does not add carbon dioxide to the carbon cycle.

Detailed explanation-4: -Carbon dioxide is added to the atmosphere naturally when organisms respire or decompose (decay), carbonate rocks are weathered, forest fires occur, and volcanoes erupt. Carbon dioxide is also added to the atmosphere through human activities, such as the burning of fossil fuels and forests and the production of cement.

Detailed explanation-5: -Carbon is released back into the atmosphere when organisms die, volcanoes erupt, fires blaze, fossil fuels are burned, and through a variety of other mechanisms.