Glucose is broken down during cellular respiration to produce carbon dioxide and

D) water vapor

The products of cellular respiration are carbon dioxide and water vapor.

In sufficient oxygen, all combustion reactions produce these two products. When you exhale, you release the two by-products of respiration. Put your hand in front of your mouth and feel the water vapor!                                  

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the answer is c. it will give up it's valence electron to the other atom.