You are presented with the question "harming an animal species has a negative impact on the what?" and the following answer choices: 
- sub-units of species
 - single-celled organisms
 - diet of species
 - most organisms
 - color of species
 - ancestors of species
 - Abnormal cell growth
 - Males and females

Now knowing that harming an animal species has a negative impact on the population size of that species and populations are the sub-units of species, choose the best answer.


 

 sub-units of species        