Question: In one of the steps of the carbon cycle, a person exhales a molecule of carbon dioxide (CO2) into the atmosphere. Which of the following is most likely to happen next to the atom of carbon in this molecule?

  Options: 
 A. It may be used as part of a sugar in a plant.
 B. It may become part of a protein in an animal.
 C. It may be consumed as a fossil fuel is burned.
 D. It may be decomposed into carbon and oxygen by a bacterium. 
Answer: A