Which phylum is characterized by a water vascular system?

Which phylum is characterized by a water vascular system?

• A. Echinodermata
• B. Chordata
• C. Mollusca
• D. Annelida

Answer: (A)

The water vascular system is a distinctive feature of echinoderms. This system is a network of hydraulic canals derived from the coelom that powers the tube feet used for movement, feeding, and sometimes gas exchange. Because this network is unique to echinoderms, it clearly separates them from the other phyla listed. Chordates have structures like a dorsal nerve cord and not a water vascular system. Molluscs use different locomotory tools such as a muscular foot or a mantle, and annelids rely on segmented bodies and setae with a more typical circulatory system. So, the phylum that is characterized by a water vascular system is Echinodermata.

The water vascular system is a distinctive feature of echinoderms. This system is a network of hydraulic canals derived from the coelom that powers the tube feet used for movement, feeding, and sometimes gas exchange. Because this network is unique to echinoderms, it clearly separates them from the other phyla listed. Chordates have structures like a dorsal nerve cord and not a water vascular system. Molluscs use different locomotory tools such as a muscular foot or a mantle, and annelids rely on segmented bodies and setae with a more typical circulatory system. So, the phylum that is characterized by a water vascular system is Echinodermata.