Few species could exist without oxygen. Both you and the Purple Sea Urchin would perish without oxygen. As a result, the respiratory system is necessary for most forms of life.
Sea urchins breathe through their tube feet since they lack lungs or gills.
The respiratory system of sea urchins contain tube feet as primary breathing organ .
Intertidal sea urchins will stack pebbles and shells on top of themselves as a kind of defense. They dig out burrows in the soft rock over many generations, occasionally encasing themselves in a fortified prison. Bacteria can also cause damage to sea urchins .
To learn more about tube feet click here,
https://brainly.com/question/29494088
#SPJ4
