Which of the following is the best description of a chemical reaction?

the calvin cycle has three stages. in stage 1, the enzyme rubisco incorporates carbon dioxide into an organic molecule. in stage 2, the organic molecule is reduced. in stage 3, rubp, the molecule that starts the cycle, is regenerated so that the cycle can continue

d.

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b - the respond is innate and varies over time.

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the endomembrane system i think