You are presented with the question "what are not cells?" and the following answer choices: 
- 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

Now knowing that viruses are not cells and viruses Viruses are the smallest agents of disease, choose the best answer.


 

   smallest agents of disease      