Why is carbon dioxide a key molecule in the light-independent (dark) reactions of photosynthesis?
A) CO2 provides electrons to replace those lost by chlorophyll during the light-dependent reactions.
B) CO2 provides the carbon for the synthesis of sugars during carbon fixation.
C) CO2 is the major product of the light-independent reaction.
D) CO2 provides the energy for substrate-level phosphorylation.
Correct Answer:
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