The water vascular system, tube feet, and radial symmetry are characteristic features of the phylum:

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The phylum Echinodermata (spiny-skinned animals like starfish, sea urchins, sea cucumbers) is uniquely characterized by a water vascular system used for locomotion, capture and transport of food, and respiration. The tube feet are the terminal effectors of this system. They exhibit secondary radial symmetry in adults, though their larvae are bilaterally symmetrical. Mollusks have a muscular foot, and arthropods have jointed appendages.

The water vascular system, tube feet, and radial symmetry are characteristic features of the phylum: MCQ with Answer and Explanation

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