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(A) Photosynthesis occurs in two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle).$1$. The first system i

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Fixes $CO_2$

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(A) Photosynthesis occurs in two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle).$1$. The first system is the light reaction,which traps light energy to produce $ATP$ and $NADPH$.$2$. The second system is the light-independent reaction (Calvin cycle),which utilizes the $ATP$ and $NADPH$ produced in the first stage to fix $CO_2$ into organic compounds (sugars).Therefore,the second system is responsible for the fixation of $CO_2$.

Photosynthesis consists of essentially two biological reaction systems,one followed by the other. The second of these systems does which of the following?

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