Question

Which of the following is expected to occur if a keystone species is removed fram an ecosystem?

a. A niche is eliminated
b.Competition is reduced
c. Other speciesmove toward stable populations
d. The ecosystem collapses

Answer 1

I believe the answer is D, the ecosystem collapses. A keystone species is a very important species in an ecosystem that other species depend on greatly, so if they [keystone species] disappear, all the other species suffer and the ecosystem collapses.

Answer 2

Lesson 7: Population Changes Due to Organism Interactions

1. Species B is the predator of species A.

2. B. The vegetation it eats increases and then decreases repeatedly with changing seasons.

3. B. The deer population will increase, and will strip the vegetation to become overgrown.

4. D. The ecosystem collapses.