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How is oxygen used by living organisms?
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It controls the amount of heat produced.
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Its a source of energy.
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It is used to release energy that is stored in food.
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It is part of water and is necessary to keep organisms hydrated.
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Oxygen is used by living organisms to release energy that is stored in food through a process called cellular respiration. During cellular respiration, oxygen combines with glucose (a sugar molecule) to produce carbon dioxide, water, and ATP (adenosine triphosphate), which is the energy currency of cells. This process occurs in the mitochondria of cells and is essential for the survival and functioning of living organisms.