Answer:
Keystone species provide protection to the other species of the ecosystem and maintains biodiversity of that ecosystem.
Step-by-step explanation:
Keystone species may be defined as the species that has large effect on its environment relative to the abundance of keystone species. Wolf, bison and beaver acts as a keystone species.
Keystone species maintains the structure of the community. This species determines the number of other different types of species. Other species may directly or indirectly depends on the keystone species.
Thus, keystone species has an important effect on the ecosystem.