Biology

The correct definition of a keystone species is: C.A species that has a large impact on its habitat.

Keystone species play a crucial role in maintaining the structure, diversity, and functioning of an ecosystem, even though they may not be the most abundant species. Their actions have a disproportionately large effect on the ecosystem compared to their population size.

The other options are incorrect because:

A.A species that is at the top of the food chain: While predators at the top...