Answer: The three phases are carbon fixation, reduction, and regeneration.
Explanation: In stage 1, the enzyme RuBisCO incorporates carbon dioxide into an organic molecule. In stage 2, The 3-PGA molecules created through carbon fixation are converted into molecules of simple sugar–glucose. This stage obtains energy from ATP and NADPH formed during the light-dependent reactions of photosynthesis. The organic molecule is reduced. In stage 3, RuBP, the molecule that starts the cycle, is regenerated so that the cycle can continue.
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