Because a dolphin is a mammal, and not a fish. A dolphin's respiratory system is similar, for the most part, to a human's respiratory system.
dolphins can hold their breath for 30 minutes
They don't. When submerged, dolphins hold their breath.
about 7 minutes
Dolphins and Whales can stay under water for so long is because they have blowholes to come to the surface and get air. They can stay under water for quite a while before they need another breath at the surface:) Need more help... Just ask!!!!!!!!!!!!!!
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.
No, they have the ability to hold their breath for long periods of time. (ie. whales, dolphins, etc.)
No. Dolphins spend three quarters of their time underwater. Dolphins can hold their breath for an unbeliveable time. So they have bigger lungs.
Spotted dolphins can hold there breath under water for 7 to 8 minutes
They can't. Dolphins and Whales have lungs, not gills. they have to Surface to Breathe. They hold their breath while diving.
They need them to breathe through. Dolphins, being mammals, have to inhale air and hold their breath underwater.
Whales, dolphins, and maybe a platypus.
Dolphins can't breathe underwater because they are mammals. They go to the surface to breathe and then hold their breath while underwater