During cellular respiration ,every living thing in this food web uses-gas and releases-back into the environment

During cellular respiration ,every living thing in this food web uses oxygen and release carbon dioxide into the environment.

Explanation:

Cellular respiration can be described as a process which every cell in an organism's body carries out to generate energy. Cellular respiration is a process by which sugar (glucose) and oxygen are converted into carbon dioxide and water with the release of ATP molecules. ATP is the driving energy source for each cell. Each cell requires ATP to carry out normal cell functions. The excess carbon dioxide produced by this reaction is released into the atmosphere.

i am positive it is c. condensing but i may be wrong