.......... is an unique water filled system possessed by echinoderms.

Canal system

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Ambulacral system

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Haemal system

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None of the above

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Solution

The correct option is B Ambulacral system
The radially symmetrical body cavity contains a system of water-filled canals unique to echinoderms, called as the water-vascular system or ambulacral system. It connects with the tube feet, which are extensions of the body wall that generally protrude through holes in the skeleton.
Therefore, the correct answer is option B.

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