Where does the carbon comes from that makes up the glucose molecules?

from CO2

Explanation:

carbon dioxide

Explanation:

The carbon atoms used to build carbohydrate molecules comes from carbon dioxide, the gas that animals exhale with each breath. The Calvin cycle is the term used for the reactions of photosynthesis that use the energy stored by the light-dependent reactions to form glucose and other carbohydrate molecules

the answer is b.) hydrogen bonds between bases.

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