Question

what is fermentation​

Answer 1

THE CHEMICAL BREAKDOWN OF A SUBSTANCE BY BACTERIA, YEASTS, OR OTHER MICROORGANISMS, TYPICALLY INVOLVING EFFERVESCENCE AND THE GIVING OFF OF HEAT.

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Answer 2

Fermentation is a chemical process by molecules such as glucose are broken down anaerobically. More broadly, fermentation is the foaming that occurs during the manufacture of wine and beer, a process at least 10,000 years old.