Question

in a wilderness area. since then, the elk population increased, and scientists observed their... aspen, and cottonwood trees. beavers depend on willow trees to survive in the winter. biologists... with the hope of controlling the size of the elk population and improving the health of the park... represents the population size of these three species in this wilderness area before and after the... population sizes of three species before and after reintroduction of wolves... was the reintroduction of wolves an effective solution for these three species? complete the table by using the labels that best explains the result for each species. species: wolf, elk, beaver; column: effective solution?

Explanation:

• Wolf: Reintroduction increased their population (from near - zero to present), so effective (label: Yes, population increased).
• Elk: Population decreased (from high to lower), which was the goal to control size, so effective (label: Yes, population controlled).
• Beaver: Population increased (as elk overgrazing on willow (beaver's food) reduced, willow recovered, supporting beavers), so effective (label: Yes, population increased).

Answer:

Species	Effective Solution?
Elk	Yes (population controlled)
Beaver	Yes (population increased)