Answer:
photosynthesis pulls carbon dioxide out of the atmosphere.
Step-by-step explanation:
While cellular respiration releases carbon dioxide into the environment, The exchange of carbon dioxide and oxygen photosynthesis pulls carbon dioxide out of the atmosphere. during photosynthesis (Figure below) and cellular respiration worldwide helps to keep atmospheric oxygen and carbon dioxide at stable levels.
OR
At the simplest level, the reactions of photosynthesis take in carbon dioxide from and release oxygen into the atmosphere and the reactions of cellular respiration consume oxygen and release carbon dioxide. This creates a cycle. It's actually a little more involved than it first seems. The oxygen released by plants is not the same oxygen in the carbon dioxide molecules they just took in. The carbon dioxide taken in is incorporated into the sugars produced by photosynthesis. Those sugars get used by the plant (via cell respiration) for food or get eaten by an animal for food. Cell respiration (in either type of organism) releases some of the oxygen in those sugars as carbon dioxide which can be taken in by plants to build more sugars.