Final answer:
Ethanol fermentation produces ethanol and carbon dioxide, while lactic acid fermentation produces lactic acid. They occur in yeasts, bacteria, and muscle cells.
Step-by-step explanation:
Both ethanol fermentation and lactic acid fermentation are types of anaerobic cellular respiration that occur in the absence of oxygen. Ethanol fermentation produces ethanol, carbon dioxide, and NAD+.
It is carried out by yeasts and some bacteria and is used to make bread, wine, and biofuels. Lactic acid fermentation, on the other hand, produces lactic acid (lactate) and NAD+. It occurs in certain bacteria and our muscle cells during intense exercise.