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The three stages of cellular respiration are glycolysis, the Krebs  Cycle, and the electron transport chain. The first stage happens in  the cytoplasm while the last two occâ¦urs in the mitochondria. 1 person found this useful.
During glycolysis, two molecules of pyruvate are formed from one molecule of glucose. Glycolysis is the first step in cellular respiration. During aerobic respiration, there is an adequate oxygen supply and acetyl-coenzyme A is formed. This molecule is the main input for the Krebs Cycle.