A. Brown bears are important because ...
Correct answer: they control the number of other animals (1)
Explanation: Brown bears play an important role in the ecosystem as predators that keep the populations of other animals under control. By preying on other animals, brown bears help maintain a balance in the food chain, preventing overpopulation of certain species.
B. Which is NOT a threat to the population of brown bears according to the text?
Correct answer: People hunt bears to keep them in zoos (4)
Explanation: The text mentions various threats to the population of brown bears, such as people killing animals, destroying forests, and hunting bears for trophies. However, keeping bears in zoos is not mentioned as a specific threat in the text.
C. A thick layer of body fat helps a polar bear to ...
Correct answer: survive in a cold climate (1)
Explanation: The thick layer of body fat in polar bears serves as insulation against the cold climate, helping them survive in their icy habitats by retaining body heat. This adaptation allows polar bears to thrive in the Arctic's harsh conditions.