There are crabs which breathe water and crabs which breathe air. It is rare to find a crab that does both but intertidal crabs do but they must remain wet to breath air (strange, right?).
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.
Crabs have gills. The underwater ones have larger gills than the terrestrial ones. Terrestrial crabs use the humidity in the air to breathe. this is why crabs live near water even if they are land dwellers. some crabs have very small and basic lungs but these cannot function without water and are usually attached to some sort of gill.
yes, but they can't breathe in water. they're related to crabs and lobsters.
Yes. Kit Fisto's species, the Nautolans, are amphibian-like creatures (they can breathe above and under water)
Crabs have gills that extract oxygen from the water, allowing them to breathe underwater. They take in water through their mouths and absorb the oxygen through their gills, while releasing carbon dioxide back into the water.
Crabs have gills. They breathe by letting water run over their gills and getting the oxygen out of it. Crabs that spend some time on land carry a little water inside their shell so they can still breathe. This is why you see them running in and out of the water at the seashore.
They don't, any aquatic reptile needs to return to the surface to breathe after a while, the only creatures that can breather underwater are fish (and all their variants ie: sharks, stingrays etc)
Yes, hence some species are able to live at great depths in the oceans
yes, because you can't breathe in water.
Fish breathe underwater using their gills. As water passes over their gills, oxygen is absorbed from the water and carbon dioxide is released. This process allows fish to extract oxygen from the water and breathe efficiently.
well yes they do 'breathe' underwater with their gills
yes they do live underwater