Because some foods have natural preservative and never go off (such as honey) while others don't have that and react with the air or what the air contains (such as apples they react with the oxygen in the air.
because food are different,some are perishable,some are non perishable and some are semi perishable.
foods that are high in moisture and in fat are more likely to be perishable
Perishable foods are foods that are high in moisture and high in fat content. These conditions allow bacterial growth to manifest quickly.
Most foods that are perishable need to be stored in a refrigerator. Perishable foods spoil faster if they are not refrigerated.
perishable foods
fruits
kool
fruits
Refrigeration
no
Basically, things that do not go "off" or grow mold or need to be kept in the refrigerator.
Perishable foods are stored under refridgeration. Huge cooling units are what keeps the goods from spoiling.
Dried fruits, flour, dry mixes, and grain products are semi-perishable foods. This type of food can stay unspoiled for up to a year if stored properly.