Question

what is preservation and write their methods

Answer 1

preservation is a method for storing food for later use.
methods are
by salt and sugar
by oil and vinegar
by storage and packing
by hot and cold treatment and others.
mark this answer brain list please.

Answer 2

Food preservation. Food preservation prevents the growth of microorganisms (such as yeasts), or other microorganisms (although some methods work by introducing benign bacteria or fungi to the food), as well as slowing the oxidation of fats that cause rancidity.

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