This phylum's skeleton is composed of miniscule networks of calcium carbona
This phylum's skeleton is composed of miniscule networks of calcium carbonate known as stereom. These animals possess ampullae in their tube feet, which is part of their water vascular system used for feeding, moving, and breathing. Examples of this phylum include class Asteroidea. The only deuterostome phylum other than the Chordates, for 10 points, name this phylum which includes sea urchins, starfish, and sand dollars.
This phylum's skeleton is composed of miniscule networks of calcium carbonate known as stereom.
{echinoderms} [or {echinodermata}]