Fact 1: Pathogens can cause disease.

Fact 2: Pathogens: bacteria, protozoans, and viruses .

Given the two facts above, answer the question "What can cause disease?" with the following options: 
- imbalanced
 - heterotrophs
 - smoking
 - viruses
 - chickenpox
 - Bacteria
 - toxins
 - Pesticides


 

      Bacteria   