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The best statement that describes how photosynthesis and cellular respiration are related to each other is:
**A. Products of one process are used as some of the reactants for the other process.**
In photosynthesis, plants convert carbon dioxide and water into glucose and oxygen using sunlight. In cellular respiration, plants (and other organisms) break down glucose and oxygen into carbon dioxide and water, releasing energy in the process. Essentially, the products of photosynthesis are the reactants for cellular respiration, and vice versa.