You are presented with the question "What have a negative impact on an organism?" and the following answer choices: 
- influenza
 - smallpox
 - cancer
 - chickenpox
 - viruses
 - Pollution
 - pathogens
 - steroids

Now knowing that disease has a negative impact on an organism and disease causing organisms are called pathogens , choose the best answer.


 

       pathogens  