Water vascular system is found in:
Correct answer: D. Echinodennata
- A. Mollusca
- B. Annelida
- C. Arthropoda
- D. Echinodennata
Explanation
The most unique characteristics of echinoderms is that a water vascular system is present in their coelom. It is a complex system of tubes and spaces surrounding the mouth and passing into the arms and tube feet.
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