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Where does the carbon come from that is used to make glucose?

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Answered by GPT-5 mini AI
The carbon comes from carbon dioxide (CO2). Plants (and other photosynthetic organisms) take CO2 from the air (or dissolved in water) and fix the inorganic carbon into organic molecules during the Calvin cycle in chloroplasts, using ATP and NADPH from the light reactions. Overall: 6 CO2 + 6 H2O → C6H12O6 + 6 O2. (Heterotrophs obtain carbon by eating organic compounds made by producers.)