Question

crabs need/ does not need water​

Answer 1

Some crabs, like coconut crabs and land hermit crabs, are terrestrial and breathe well without water, although they still need to keep their gills moist. As long as their gills stay moist, these crabs can spend their lives out of the water. But if they were submerged in water, they would die.

Answer 2

$\huge\color{purple}{\mid{\fbox{\tt{Answer}}\mid}}$

Crabs need water.

Note :-

Some crabs, like coconut crabs and land hermit crabs, are terrestrial and breathe well without water, although they still need to keep their gills moist.