Why does milk go bad?

Answer

The bacteria present in milk uses the the sugars in milk as food to reproduce and grow and spoil the milk. Keeping the milk cooled slows down the growth of bacteria.
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lactic acid bacteria turning the sugar inside the milk into lactic acid. This fermentation process is exploited in the production of various dairy products such as cheese and yogurt
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1 Additional Answer
After some time the milk go bad because in the milk there is a bacteria that uses the lactose as a source for energy. Then the milk turns into lactic acid and the taste is bad and sour.
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