Answer: Refrigeration
Explanation: Food preservation is the technique of preserving food items from spoiling. It is done by preventing the growth of microorganisms and preventing the rancidity of fats.
In ancient times, the methods used for preservation of foods were drying foods which remove water and thus reduces the bacterial growth, smoking raw meats also hampers the bacterial activity and salt curing leads to osmosis and thus the bacteria dies.
The latest method is refrigeration which makes the food colder and the rate of deterioration gets slow. Bacterial action reduces with refrigeration, as bacteria cannot survive at low temperatures.
