Fermentation is an anaerobic process (meaning it doesn't require oxygen) used by many cells to produce ATP from glucose when oxygen levels are low or absent.
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Lactic Acid Fermentation: A type of fermentation that occurs in animal cells and some bacteria where glucose is converted into lactic acid and ATP.
Alcoholic Fermentation: A type of fermentation that occurs in yeast and some bacteria where glucose is converted into ethanol, carbon dioxide, and ATP.