Answer:
Lemon juice is one of the most common(I use this method), as well as cold temperatures
Step-by-step explanation:
The reason why lemon juice is a common way to perserve fruit, is because the acid in lemons prevents mold growth,
It also, prevents oxygen to affect the surface of the fruit.
Refridoraitng and freezing fruits and veggies also help.
The cold conditions causemost bacteria and mold to die and be incapable of surviving on the foods.
It also slows down the fruit and vegtables chemical proccess which realeases what is called ethylne. This is a enzyme.
This enzyme makes cells "run" their genetic code that begins the ripening process in foods.
So basically, the cold temperatures slows down the production of this enzymem, slowing the riping process.
Hope this helps!