In the carbon cycle, organisms exchange carbon dioxide with the atmosphere. What would likely happen if plants were removed from the carbon cycle?

a. The process of photosynthesis will not happen and carbon dioxide from the atmosphere will not enter the living system.
b. The process of photosynthesis will cease, and as a result carbon dioxide will not be released into the atmosphere.
c. The process of respiration will occur, but less amounts of carbon dioxide from the atmosphere will enter the living system.
d. The process of respiration will occur, but organic carbon will not be converted to carbon dioxide for release into the atmosphere.

a. The process of photosynthesis will not happen and carbon dioxide from the atmosphere will not enter the living system.