A characteristic feature of Echinoderm is:
Correct answer: B. Water vascular system
- A. Canal system
- B. Water vascular system
- C. Tracheal system
- D. Blood vascular system
- E. None of these
Explanation
The characteristic of adult echinoderms is the possession of a water vascular system. There is no true heart and blood and no tracheal or canal system.
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