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A. they are used for cellular respiration

Explanation:

The light independent reaction or the dark reaction of photosynthesis also called calvin cycle which consist of many enzyme catalyzed biochemical steps that ultimately result in the formation of glucose.

 The so formed glucose during calvin cycle undergo cellular respiration basically aerobic respiration which involves glycolysis,krebs cycle ans oxidative phosphorylation that finally leads to form energy in form of ATP or Adenosine tri phosphate along with water and carbondioxide as byproducts.

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