Answer: C) They have different end products
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The two types of fermentation are lactic acid and alcohol fermentation. Both occur when there is a lack of oxygen, meaning these are anaerobic processes, eliminating answer choice B. These processes are both used to produce ATP when there is a lack of oxygen, eliminating choice A. Both also start with the same sugar, glucose, which is broken down into the pyruvate used for both processes, eliminating choice D.
Their end products are different. Lactic acid fermentation creates lactic acid, while alcohol fermentation creates ethanol and CO2, making C the correct answer.