2) they help people to protect other animals. 3) they can be found only in tundra. 4) they do not live in many countries. B. Which is NOT a threat to the population of brown bears according to the text? 1) People kill animals. 2) There are few places where they can live. 3) People destroy forests. 4) People hunt bears to keep them in zoos. C. A thick layer of body fat helps a polar bear to 1) survive in a cold climate. 2) swim very well. 3) be speedy. 4) live in different parts of the world. D. According to the text young polar bears ... than adult bears. 1) swim more slowly 2) run more quickly 3) are heavier 4) have more body fat E. Polar bears have to hunt a lot of time because ... 1) they swim a lot. 2) they run a lot. 3) they need to be fat. 4) they must be at the top of the food chain.