Fact 1: Viruses are usually considered to be nonliving.

Fact 2: Variola major, the virus that causes smallpox, is considered a potential bioterrorism agent.

Given the two facts above, answer the question "Many believe the cause of smallpox to be what?" with the following options: 
- fever
 - negative
 - contamination
 - Allergies
 - Nonliving
 - heat or cold
 - dangerous
 - Leptospirosis


 

     Nonliving    