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

Fact 2: Viruses include the Tobacco Mosaic Virus.

Given the two facts above, answer the question "How can cells of the Tobacco Mosaic be seen?" with the following options: 
- refraction of light
 - an area swollen with pus
 - by indirect light
 - death and devastation
 - bending light rays
 - electron microscope
 - deadly and devastating
 - Veins and arteries.


 

      electron microscope   