They use a blow hole to breathe in/out air when the surface the water.
No mammals can breathe underwater. All mammals, including sea mammals, must breathe above the surface of the water. This is why marine mammals such as dolphins and whales frequently come to the surface.
To breathe
Dolphins are mammals. They breathe air with lungs, pretty much just like you and I. They can't breathe water. When they dive they hold their breath.
They don't. Dolphins and whales breathe air just like we do. They can hold their breath for a long time, but they come up to the surface to breathe.
Salmon are fish- they breathe water, and lay eggs. Dolphins are mammals- they breathe air, give live birth to baby dolphins, and nurse their babies. Two totally different animals- they just both happen to live in water.
They don't. Dolphins have lungs, and have to Surface to Breathe. Thye hold their breath while diving.
Dolphins breathe with lungs while sharks breathe with gills.
dolphins are mammals, not fish. They have lungs, not gills, and breathe air.
Dolphins are mammals. They breathe air.
They breathe through their blowhole.
Most fish always have to stay in water. Dolphins come up to the ocean surface for a breath of hair. Dolphins breathe through their blowhole.
Dolphins can't breathe underwater because they are mammals. They go to the surface to breathe and then hold their breath while underwater