Which group is known for a water vascular system used for movement and feeding?

Which group is known for a water vascular system used for movement and feeding?

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

Answer: (D)

The water vascular system is a hydraulic network unique to echinoderms, powering their tube feet for both movement and feeding. This system uses seawater to extend and retract the tube feet, allowing the animal to crawl, cling to surfaces, and manipulate prey. Because chordates, molluscs, and arthropods rely on different locomotor and feeding adaptations (muscular feet, limbs, or exoskeleton-based movement) and do not have a water vascular system, the group that uses this mechanism is echinoderms.

The water vascular system is a hydraulic network unique to echinoderms, powering their tube feet for both movement and feeding. This system uses seawater to extend and retract the tube feet, allowing the animal to crawl, cling to surfaces, and manipulate prey. Because chordates, molluscs, and arthropods rely on different locomotor and feeding adaptations (muscular feet, limbs, or exoskeleton-based movement) and do not have a water vascular system, the group that uses this mechanism is echinoderms.