gills
No, crabs are "invertebrate" animals, they do not have a backbone.
They have gills under their mouths that allow them to breathe. When the gills start to dry out, foam forms at the mouth, telling you that the crab has trouble breathing.
mud skipper and any shell fishes .
the same as humans unless your a reptile or fish.
It has gill chambers to store water so that they can breathe using dissolved oxygen from the water while on land.
Some spiders and insects that live in part underwater carry air bubbles with them to breathe through.
a Halloween crab is a crab in a costume a Halloween crab is a crab in a costume
yes.
The Alaskan crab is much larger than the coconut crab. The coconut crab weighs up to 9 lbs. and the Alaskan crab weighs up to 18 pounds.
~colossal crab ~Deceptive crab ~drunken crab ~etc.
It depends on the type of crab. For example, fiddler crabs are of the genus Uca (Ocypodidae). And the blue crab is in the genus Chionoecetes.
green crab or dogga crab