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

Fact 2: Fermentation occurs through the action of microorganisms in the large intestine.

Given the two facts above, answer the question "Irradiating food can be used to kill what in the food?" with the following options: 
- Something that causes attraction
 - one celled organisms
 - Something that causes fermentation
 - Something that causes digestion
 - microscopic building blocks
 - single-celled organisms
 - Microscopic organisms
 - Something that causes evaporation


 

   Something that causes fermentation      