Question

why fresh food should be kept covered
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Answer 1

Answer:

Keeping food covered protects your food from harmful bacteria and objects or chemicals from getting into the food. There are certain defenses that can be used for raw and ready-to-eat foods to prevent the harmful bacteria from spreading. You can package the food properly in cling foil

Answer 2

Answer:

so it doesn't react with oxygen in air to prevent it from stale and rancidity