Fact 1: Viruses are not cells.

Fact 2: Viruses Viruses are the smallest agents of disease.

Given the two facts above, answer the question "what are not cells?" with the following options: 
- Something coming from a gland
 - remains of prehistoric life
 - smallest agents of disease
 - an infected needle
 - an area swollen with pus
 - They may not survive.
 - Leptospirosis
 - microorganisms


 

   smallest agents of disease      