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The whale is the largest mammal in the world. ___1___
the whale is shaped like a fish, why is it still ___2___
a mammal ? The fact is that the whale ___3___
live on land a very long time ago. However, ___4___
its thousands of years of living in water, the whale
gradually ___5___
structured like a fish. Thus, the whale has ___6___
to marine life. Nevertheless, though the whale ___7___
the fish externally, it still ___8___
the characteristics of a mammal.
One important difference ___9___
a whale and a fish is that the baby whale is ___10___
alive. It is not ___11___
from an egg. Furthermore, the baby whale is fed ___12___
its mother's milk just like other mammals.
Unlike ___13___
sea creatures, the whale is a warm blooded animal.
It keeps ___14___
warm in the cold water with a layer of blubber.
'Blubber' is a layer of oily tissue ___15___
protects the internal organs and retains heat.
Fishes breathe ___16___
their gills. Whales, however, have lungs ___17___
of gills. They breathe by using nostrils ___18___
on the top of their heads. When they dive into the
water, these nostrils are ___19___
so that no water can enter. Every few minutes, the
whale rises ___20___
the water to breathe. When it blows
___21___
the used air from its lungs, water shoots out from
its nostrils. ___22___
creates a 'fountain' that we usually ___23___
in pictures of whales.
The biggest whale, the blue whale, is also the
largest animal in the world. It can ___24___
to be more than one hundred feet long and is
commonly found in ___25___
Pacific Ocean.
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