Grapes turning into wine is an example of fermentation. Fermentation
is a cellular process that does not require oxygen. It is changing carbohydrates
into alcohols, carbon dioxide or organic acids using bacteria or yeast. Because
grape skin contains natural bacteria and yeast, it is fermented with its skin. After
the grapes have been made into grape juice, if it is put at the right
temperature, then the yeast turns the sugar in the grape juice into alcohol and
carbon dioxide. That is the process of grape fermentation.
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