Water vascular system is the unique character of _______

Echinodermata

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Arthropoda

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Protochordata

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Mollusca

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Solution

The correct option is A Echinodermata
The water vascular system is a unique and defining characteristic of Echinodermata like sea urchins. It is a hydraulic system. It consists of canals connecting thousands of tube feet. It controls these tube feet that live in the ambulacral grooves. Tube feet are also called as podia. These participate in locomotion, exchange of gas and waste, feeding, respiration and as sensory receptor.
Thus, the correct answer is 'Echinodermata.'

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