The 2 methods of food preservation is refrigeration and canning
enumerate the different methods in preserving food
Salting, Pickling etc
Pasteurization
Some alternative methods for preserving food without a pressure cooker include water bath canning, pickling, fermenting, drying, and freezing. These methods can help extend the shelf life of food by inhibiting the growth of bacteria and other microorganisms.
Please study your text book. There are many methods or curing , or preserving, food.
Methods of preserving food include smoking and drying. Canning is another common method of food preservation. Pickling is one of the oldest forms of food preservation.
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because food is so important to survival foo preservation is one of the oldost methods.
It was mostly caned food and dehydrated food.
why is there need for preserving food ? explain
It does not take the moisture out of food therefor not preserving it.
Oxygen absorbers are effective for preserving freshness in food storage for about 6 months to 2 years, depending on the type and quality of the absorber.