Cellular respiration and photosynthesis are complementary processes in the energy cycle of living organisms. Photosynthesis converts solar energy into chemical energy by producing glucose and oxygen from carbon dioxide and water, primarily in plants. Cellular respiration, on the other hand, breaks down glucose in the presence of oxygen to release energy, carbon dioxide, and water. Essentially, the oxygen and glucose produced in photosynthesis serve as the reactants for cellular respiration, while the carbon dioxide and water released in respiration are used in photosynthesis, creating a cyclical relationship.
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