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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.
Cellular respiration begins first outside of the mitochondria in the cytoplasm - the reason for this is because the mitochondria used to be its own cell before it was engulfed by some ancient cell that has developed into both animal and plant cell...