BÀI 9: UNDERSEA WORLD

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Summer holidays

Read the passage and do the task that follows/do the tasks that follow

The whale is the largest animal in the world. Since the whale is shaped like fish, why is it still considered a mammal? The fact is that the whale did live on the land a very long time ago. However, during its thousand of years of living in water, the whale gradually become structured like a fish. Thus, the whale has adapted to marine life. Nevertheless, though the whale resembles the fish externally, it still has the characteristics of a mammal.

One important difference between the whale and a fish is that the baby whale is born alive. It is not hatched from an egg. Furthermore, the baby is fed on its mother's milk just like other mammals.

Unlike other sea creatures, the whale is a warm blooded animal. It keeps itself warm in the cold water with a layer of blubber. "Blubber" is a layer of oily tissues that protects the internal organs and retains heat.

Nguồn: Internet