Why does polar bear close its nostrils during swimming under water?

1.	Why does polar bear close its nostrils during swimming under water?
Answer» Explanation: POLAR BEARS can CLOSE it's nostrils when under water as it SWIMS so that it can swim under water for a long time. By CLOSING it's nostrils it prevents the water from entering it's lungs. Thus when it closes it's nostrils, no water goes inside.

Answer»

Explanation:

POLAR BEARS can CLOSE it's nostrils when under water as it SWIMS so that it can swim under water for a long time. By CLOSING it's nostrils it prevents the water from entering it's lungs. Thus when it closes it's nostrils, no water goes inside.

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Why does polar bear close its nostrils during swimming under water?

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