Harming an animal species has a negative impact on the population size of that species.
Species are the different kinds of organisms.
Harming a kind of animal has a negative impact on the population size of that animal.
What is impacted from harming a kind of animal?
Options:
  - no impact
  - Pesticides
  - species in other environments
  - that animals' prey
  - an object
  - population size
  - Endocrine system
  - most organisms