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      Question

      What is true for phylum echinodermata ?

      A They are triploblastic and have coelomic cavity. Correct Answer Incorrect Answer
      B They have a peculiar water-driven tube system. Correct Answer Incorrect Answer
      C They are exclusively free-living marine animals. Correct Answer Incorrect Answer
      D More than one of the above Correct Answer Incorrect Answer
      E None of the above Correct Answer Incorrect Answer

      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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