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In the process of photosynthesis, plants use water (H2O), carbon dioxide (CO2), and energy from sunlight to produce sugar. In the process, they give off oxygen (O2) as a waste product. Does the oxygen come from the water or the carbon dioxide?

Answer:

During photosynthesis, the water molecules are broken down. The hydrogen is combined with the carbon dioxide to make sugar, and the oxygen is given off as a waste product. The oxygen you are breathing came from water molecules taken apart by plants.
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