<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
We all know that milk goes bad if not refrigerated, but why doesn’t it go bad inside the cow?
<|assistant|>
The reason milk does not go bad inside a cow is because of anaerobic fermentation. During this process, the milk is kept at a certain temperature which prevents aerobic bacteria from forming which causes spoilage. Anaerobic bacteria, which are also found in the animal's gut, produce lactic acid, which preserves the milk. The presence of these bacteria is what gives raw, unpasteurized milk its distinct taste. Pasteurization, which involves heating the milk to a high temperature, kills the bacteria and prevents spoilage. This process also reduces harmful bacteria present in unpasteurized milk, making it safer for consumption.