Question: Why does ethanol fermentation produce co2?
Answer: Ethanol is fermented, by a single celled microorganism called a yeast, from sugars and starches. Like most animals on earth, when the yeast consumes and brakes down the sugars and starches to produce its waste product (which happens to be ethanol in the case of yeast) it undergoes respiration to expel carbon dioxide. For this reason, when yeast is fermenting it produces carbon dioxide as it brakes down sugars and starches into ethanol.
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