In the process of photosynthesis and aerobic respiration why the amount of oxygen and carbon dioxide remains the same?

Plants capture sunlight to acquire energy needed to produce their own food. Photosynthesis uses light energy to convert water and carbon dioxide into glucose and oxygen. Cellular respiration provides usable energy for the cell in the form of ATP. Water and carbon dioxide are products of cellular respiration.

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

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