You are presented with the question "What can be killed in food by irradiating it?" and the following answer choices: 
- heterotrophs
 - A virus
 - bacteria
 - smallpox
 - seeds
 - viruses
 - steam from rising
 - the core

Now knowing that irradiating food can be used to kill existing microorganisms in the food and bacteria is this type of microorganism, choose the best answer.


 

   bacteria      