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