Fact 1: Viruses are so small that they can be seen only with an electron microscope.

Fact 2: Objects to be viewed are illuminated by electrons in an electron microscope.

Given the two facts above, answer the question "What of the following can only be viewed by illuminating electrons? " with the following options: 
- insects
 - small animals
 - eyelashes
 - Light
 - an image
 - fungi
 - viruses
 - an object


 

       viruses  