There are many different ways of perseving food by presenting decay:
-Canning means there is no oxygen and therefore the bacteria can not multiply
-Cooking denatures enzymes
-drying removes water from the bacteria which kills the bacteria, this is done via osmosis
-Freezing slows enzymes down
-Adding salt or sugar removes moisture out of the bacteria via osmosis
-Adding vinegar denatures enzymes as its an acid
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