Fact 1: Harming an animal species has a negative impact on the population size of that species.

Fact 2: Some species of amoeba are harmful parasites.

Given the two facts above, answer the question "what can negatively impact a species?" with the following options: 
- chemicals
 - elephant
 - cells
 - dog
 - drought
 - mines
 - steroids
 - amoeba


 

        amoeba 