The death rate was greater than the birth rate. There was unlimited food for the moose to eat. The birth rate was constant and few moose died. There were no predators to control the population.
I gave my students this multiple choice question: Isle Royale is a large island in Lake Superior. During the 1800s, most of the trees were removed, and the wolves and moose that lived on the island died. In the early 1900s, moose were reintroduced to the island. By 1925, the moose population on Isle Royale rose to about 2,000 individuals. Which best explains how the moose population grew so rapidly?

Only one answer is correct among these 4 choices:
- The death rate was greater than the birth rate.
- There was unlimited food for the moose to eat.
- The birth rate was constant and few moose died.
- There were no predators to control the population.

Could you tell me which one is correct?

There were no predators to control the population.