Are you supposed to breathe out underwater or hold your breath then exhale and inhale all at once when swimming laps?
When swimming laps (as opposed to racing) you should breathe out in a continuous flow underwater so that you are ready to draw your next breath as your mouth breaks the surface.
crocodiles are reptiles, and they breathe air like humans do. They can breathe on land, infact it's easier for them to breathe if they're out of the water. Crocodiles can hold their breath for a long time underwater, which might make you think that they breathe underwater. but they don't, they just hold their breath. So, to conclude, Crocodiles do not breathe underwater, they are reptiles and breathe above the water.
Aquatic animals breathe faster than terrestrial animals because animals underwater are alwaysmoving. They are always swimming or walking on the ocean floor. The faster they swim, the faster they breathe. Terresrtial animals can rest and catch they're breath if they need to. Fish, and other underwater animals, can't rest.
A turtle needs air to breathe. Some turtles can slow their metabolism, allowing them to sleep underwater, but it must come up to the surface of the water in order to breathe. It can hold it's breath and stay underwater awhile, but it must surface to breathe or it will drown. Turtles cannot breathe underwater because they do not have gills, like fish - they have lungs, much like human lungs. Some aquatic turtles such…