Question
What is true for phylum echinodermata ?
Solution
Explanation: Echinoderms are triploblastic organisms with a true coelom (coelomic cavity). They possess a unique water vascular system, a network of hydraulic canals used for locomotion, feeding, and respiration. Additionally, they are exclusively marine and free-living. Therefore, options (A), (B), and (C) are correct, making (D) the appropriate choice.
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