gills
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.
Gills.............
The fishes have gills for breathing
Breathing with gills is called aquatic respiration. Gills are specialized structures in aquatic organisms that allow for the exchange of oxygen and carbon dioxide in water.
Crab
They use lungs and gills.
Crabs have gills that extract oxygen from water. As water flows over the gills, oxygen diffuses into the crab's bloodstream, allowing the crab to obtain the oxygen it needs for respiration.
gills are structures in fish for breathing in water while gills chambers are the cavities in which gills are enclosed
Gills
their gills
Gills