Harming an animal species has a negative impact on the population size of that species, and populations are the sub-units of species. Given these facts, harming an animal species has a negative impact on the what among the following options:
- sub-units of species
 - single-celled organisms
 - diet of species
 - most organisms
 - color of species
 - ancestors of species
 - Abnormal cell growth
 - Males and females


 

 sub-units of species        