A Water-Vascular System is Characteristic of the Phylum ____

Question

A water-vascular system is characteristic of the phylum ____.  
A) Nematoda
B) Annelida
C) Chordata
D) Mollusca
E) Echinodermata

Accepted Answer

A water-vascular system is a unique characteristic of the phylum Echinodermata, which includes organisms such as starfish, sea urchins, and sea cucumbers. This system consists of a network of fluid-filled canals that are used for movement, feeding, and gas exchange.