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Beer is usually made by fermenting malted barley. This is the barley seeds which have just sprouted, and are high in a sugar called maltose. Yeast take this sugar and convert it to alcohol in a zero oxygen environment. If oxygen were present, they would instead make vinegar instead.

Different yeasts are used to make different beers, such as ales, lagers, stouts, etc.

Yeast is also used to make other Alcoholic Beverages such as wine and liquor. Without yeast, no alcohol would be made, and no one would get drunk.

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