Fact 1: Disease-causing microbes have a negative impact on the body.

Fact 2: Each human body is unique.

Given the two facts above, answer the question "Disease causing microbes have what type of impact on humans?" with the following options: 
- toxins
 - neutral
 - negative
 - Roundworms
 - Annelids
 - positive
 - heterotrophs
 - beneficial


 

   negative      