1. [c] The Blue Whale is the world's largest animal. It weighs as much as 20 elephants. Blue Whales can grow up to 30m long and weigh nearly 150 tons.

2. [c] Whales, like humans, are warm-blooded mammals. After a baby whale is born, it nurses on its mother's milk, just like the young land animals.

3. [b] The skin of whales is usually black, grey, black and white, or all white. Some, such as the blue whale, have skin that is bluish-grey.

4. [a] Whales that live in polar regions are insulated from the extreme cold by a layer of fatty blubber enveloping their bodies.

5. [a] A young whale is called a calf.

6. [c] Whales have lungs, not gills, so they must come to the surface of the ocean to breathe.

7. [b] Whales are chiefly hunted for the thick blanket of fatty blubber, a source of oil.

8. [b] Streamlined for fast movement through the water, whales are able to swim up to 35 miles per hour (30 knots, or 56 kilometers per hour)

9. [a] Whales sometimes swim into very shallow water and become stranded on the beach. This phenomenon is called beaching, or stranding. When a whale is on shore it is helpless. Its heartbeat accelerates and its body becomes overheated very rapidly. Without the support of the water a whale cannot move and its lungs may be crushed by the weight of its body.

10. [b] Baleen whales do not have teeth. Instead they have a fringe of hard plates hanging down from roof to mouth. They feed on zooplanktons.