What is the other way to quickly make energy, which only happens in bacteria and yeast?

For glycolysis to continue, NAD + must be replenished. In bacteria and yeast, this occurs through alcohol fermentation, total production is 2 ATP per glucose. Glucose -2 NADH and 2 ATP 2 Pyruvate -2 CO2 2 Acetaldehyde -2 NAD+ End product -2 ethanol