If predators eat too many keystone species, it can lead to the ecosystem becoming unstable (Option B). A keystone species helps to define an entire ecosystem.
Keystone species are species that maintain the homeostasis (stable state) of the ecosystem.
In consequence, the lack of these species in an ecosystem would change it or cease to exist altogether.
An example of a keystone species is the jaguar that feeds herbivorous species capable of decimating plants in an ecosystem.
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