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The answer is (a) sugar. Its broken down to produce Glusose nd energy.
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The answer is sugar, as carbohydrate is taken into the body it undergoes digestion until it produces glucose which is known as blood sugar, glucose then goes through glycolysis and  its product enters the TCA CYCLE  where it produces or releases  the chemical form of energy which we call as ATP (adenosine triphosphate) it this ATP which is used as source of energy for different activities done by the cells of the body
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