Answer:

Dolphins breath through a hole in the top of the dolphin which is called blowhole.

The blowhole can empty and refill the lung in one fifth of a second through an explosive blow which can reach velocities up to one hundred miles per hour.

The blowhole is closed tightly with a group of strong muscles than surround him.

The air introduced through the blowhole, is conducted to the lungs for breathing, which is a huge difference with fish who use gills to breathe.

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