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The Calvin cycle of photosynthesis begins when

A. light becomes available.
B. electrons leave a photosystem.
C. the reduction of carbon dioxide occurs.
D. carbon dioxide is attached to RuBP.

User Willert
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The Calvin Cycle of photosynthesis begins when carbon dioxide reacts with RuBP, which is a 5-carbon carbohydrate. The enzyme called enzyme called Rubisco joins the carbon dioxide and RuBP. So the answer to your question would be D. carbon dioxide is attached to RuBP
User Nay
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