Answer & explanation:
Both are reactions of energy metabolism in order to obtain energy for other reactions from the breakdown of ATP (adenosine triphosphate).
Cellular respiration and fermentation have the same initial stage: Glycolysis, where the initial breakdown of glucose occurs (reducing glucose to smaller particles) in the energy generation process.
However, in fermentation the glycolysis process is faster because it has a lower energy yield than in cellular respiration.
