Why yeast is used in wine making industry??

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 alcohol is a byproduct of yeast. as the yeast consumes or "eats" the sugars in wine it releases carbon dioxide and alcohol. at a certain percentage of alcohol to total solution ratio, the yeast die out because the byproducts suffocate it as a human would eventually suffocate in an enclosed area. yeast are living organisms and need oxygen and "food" to live.

yeast is used in wine making industries because it respires anaerobically which results in the production of alcohol , an ingredient used in wine .