Question

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

Answer 1

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 2

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.