You are presented with the question "What of the following can only be viewed by illuminating electrons? " and the following answer choices: 
- insects
 - small animals
 - eyelashes
 - Light
 - an image
 - fungi
 - viruses
 - an object

Now knowing that viruses are so small that they can be seen only with an electron microscope and objects to be viewed are illuminated by electrons in an electron microscope, choose the best answer.


 

       viruses  