On the ventral side of an echinoderm (say, a sea star, for example) there are hundreds of tiny feet arranged into rows on each appendage. These are called tube feet. By varying the internal water pressure, the echinoderm can extend and contract its tube feet for locomotion, food collection, and respiration
What organ systems do echinodermes lacking
Gills.............
The organ responsible for breathing is your lungs.
Starfish have suction-like cups helps to open clams
lungs
Just like humans, squirrels contain lungs, the major breathing organ in the respiratory system.
Organ
lungs
nose
yes
lungs
Gills