The believe that the best answer among the choices provided by the question is A. an underground water source.
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Cellular respiration occurs in both plant and animals. It is the process by which cells convert ADP (adenosine diphoosphate) into ATP (adenosine triphosphate).Plant and animal cells cannot use ADP as a form of energy. The mitochondria within the cells convert ADP into a useable form of cellular energy: ATP.
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