Q: What do you call a predator species that affects other species' populations when its own population size changes?


Read this paragraph and choose the correct option from the provided answers:

Some predator species play a special role in their community. They are called keystone species. When the population size of a keystone species changes, the populations of many other species are affected. Prairie dogs, pictured in Figure below , are an example of a keystone species. Their numbers affect most of the other species in their community. Prairie dog actions improve the quality of soil and water for plants, upon which most other species in the community depend.

 Choices:

- paradox species

- symbiotic species

- complement species

- keystone species


A:
keystone species