Irradiating food can be used to kill existing microorganisms in the food, and some microorganisms cause meat to spoil. Given these facts,  _ food can prevent spoilage among the following options:
- chemical changes
 - Cooking
 - Enzymes
 - Dehydration
 - layers of fat
 - irradiating
 - disease
 - electricity


 

      irradiating   