A) sea-anemone
B) sea-pen
C) sea-cucumber
D) sea-horse
Correct Answer: C
Solution :
The water vascular system is a hydraulic system used by echinoderms, such as starfish, sea cucumber, etc, for locomotion, food and water transportation and respiration. The system is composed of canals connecting numerous tube feet. Echinoderms move by alternately contracting muscles that force water into the tube feet, causing them to extend and push against the ground, then releasing to allow the feet to retract.
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