Are reactants in the process of cell respiration.
water and sugar
sugar and oxygen
water and oxygen
water and carbon dioxide

sugar and oxygen

Explanation:

As it turns out, oxygen is the essential ingredient for making energy in a process called cellular respiration. ... All body cells engage in cellular respiration. They use oxygen and glucose, a sugar found in the foods we eat and convert them to ATP (adenosine triphosphate), or cellular energy, and carbon dioxide.

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