Fact 1: Irradiating food can be used to kill existing microorganisms in the food.

Fact 2: Some microorganisms cause meat to spoil.

Given the two facts above, answer the question " _ food can prevent spoilage" with the following options: 
- chemical changes
 - Cooking
 - Enzymes
 - Dehydration
 - layers of fat
 - irradiating
 - disease
 - electricity


 

      irradiating   