Question

Elk herds in Yellowstone National Park are herbivores that eat on the available vegetation. Which factor is important to ensure the stability of this ecosystem?
Responses
A The introduction of another herbivorous species to increase competition.The introduction of another herbivorous species to increase competition.
B The introduction of more elk from other parks to increase the herd population.The introduction of more elk from other parks to increase the herd population.
C The predators, such as grey wolves, to keep the elk population from growing too large.The predators, such as grey wolves, to keep the elk population from growing too large.
D Ensuring that only vegetation that is part of the elk’s diet is allowed to grow in the park.

Answer 1

C

Predators like grey wolves provide top-down control, keeping elk numbers near the park's carrying capacity and preventing overgrazing — which maintains plant diversity and overall ecosystem stability (as seen after wolf reintroduction in Yellowstone).