When foods are kept in refrigeration,
bacterial

keep temperatures low for not to cause bacteria

Explanation:

Bacteria grow best at temperatures between 40 F and 140 F, multiplying very rapidly at those temperatures in ideal strata—that is, in perishable foods like meat and dairy products. That's why it's so important to keep perishable foods refrigerated at temperatures below 40 F

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note: for words found inappropriate, i spelled them out in the phonetic alphabet in parenthesis, so take the first letter of each word to get the word i was trying to spell