Answer:
Keystones species are very functional in the ecosystem in which there removal or absence as predators can lead to explosion of prey populations and decrease diversity. Keystone species help define an ecosystem and without they ecosystem can cease to exist.
Step-by-step explanation:
Keystone species are predators species that help regulate the populations of other species through its activities or effects on the ecosystem. Keystone species exert both direct or indirect activities on the ecosystem. An indirect interaction occurs when species influence one another through their interactions with other species. Which can be inform of competition, interaction modifications e.t.c