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Anaerobic digestion of SIMPLE SUGARS by yeast like organisms - it is a metabolic byproduct. This is called fermentation.

There are also iindustrial methods, some of which employ basically the same process on much larger scales. In practice, however, much ethanol is made from petroleum via ethylene (also called ethene) produced during refining and other chemical treatments. Fundamentally, of course, ethanol is made from, in the sense of constituted of, carbon, hydrogen, and oxygen.

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14y ago

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