Here's why:
* Fermentation is an anaerobic process, meaning it doesn't require oxygen.
* Glycolysis is the first step in cellular respiration, and it's the only step that doesn't require oxygen.
* Glycolysis breaks down glucose into pyruvate, generating a net gain of 2 ATP molecules per glucose molecule.
* Fermentation then takes the pyruvate and converts it into either lactic acid (lactic acid fermentation) or ethanol and carbon dioxide (alcoholic fermentation). This step does not produce ATP.
Therefore, fermentation alone relies solely on the ATP produced during glycolysis.
