the chemical represented by box A is
the chemical represented by box B is
the chemical represented by box C is
Light independent reaction
This involves the 'fixing' of carbon dioxide and the synthesis of carbohydrates. It uses the ATP and reduced NADP produced in the light-dependent reaction. The fixing of carbon dioxide refers the conversion of inorganic carbon dioxide into organic carbon compounds. It takes place in the stroma of the chloroplasts.
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The main component of the light independent reaction is often called the Calvin Cycle.