Biology

The correct answer is D.It causes changes in the type and number of species.

When a keystone species is removed from an ecosystem, it can have a dramatic effect on the ecosystem's structure and function. Because keystone species play crucial roles in regulating populations and maintaining ecological balance, their absence often leads to significant changes in the type and number of species within the ecosystem.

Why the other options are incorrect:

A.Nothing changes: This is not true. Removing a keystone species typically triggers a cascade of effects that can disrupt the ecosystem.

B.Only the...