The fresh water crab lives in fresh water, water without salt. Salt water crab has gills that process the salt away. And those stay in salt water places like hmm oceans
it is a little crab robot with water inside of it
crab, hermit crab, and lobsterHermit crab is a kind of crab, and it doesn't actually has its own shell. Oysters have shell and lives in water.
Trilobite+sand=crab
They get oxygen from the water and air depending on what species of crab they are
Well, the water has oxygen in the water so yes, the blue creek crab can live under water forever IF it has too. It usually goes up for oxygen, but the oxygen in the water is a secondary source.
Well this sort of crab (the camouflage crab) I've researched it and it scavenge's all the dead particles in the water
Most likely your crab overheated. A crab needs tepid (not hot, not cold) water to bath in and drink from. It does not take long to heat a crab to death.
breadth
Breathe or breadth?
no because they could be land hermit crab and die
Some do. Think crab, lobster, barnacle, horseshoe crab, water beetles and even diving bell spiders.