gills,
Dolphins come up to the surface to breathe.
The most important thing that sea life has to help it breath is its gills
they breathe with gills
The classification of a Sea Urchin is Echinoidea
gills.
This depends on the organisms, but many things that live in the sea breathe through gills. There is oxygen in the water so they take in water and they will diffuse the oxygen out of the water into their cells.
sea urchin
Fish use gills to breathe underwater.
Yes, fish do 'breathe' through gills.
Fish breathe with the help with gills.
The California Sea Hare, or Aplysia californica has gills inside its body. This is how it extracts oxygen from the water.