Answer:

B

Explanation:

The Oxygen-Carbon Dioxide Cycle

Two reservoirs hold the majority of the world's carbon are the atmosphere and water. Organisms use and produce gases in photosynthesis and respiration. Plants use carbon dioxide in a process known as photosynthesis. During photosynthesis, plants give off oxygen as a waste product. Carbon dioxide moves from the air into the leaves of plants through tiny openings in the plant's leaves. Oxygen moves out of the plant leaf through these same openings. These gases flow through organisms and the environment in a cyclic process called the oxygen-carbon dioxide cycle. The oxygen-carbon dioxide cycle shows the interdependence among organisms for these important gases.