Fact 1: Disease has a negative impact on an organism.

Fact 2: Disease causing organisms are called pathogens .

Given the two facts above, answer the question "What have a negative impact on an organism?" with the following options: 
- influenza
 - smallpox
 - cancer
 - chickenpox
 - viruses
 - Pollution
 - pathogens
 - steroids


 

       pathogens  