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Echinoderms have a unique body plan characterized by a water vascular system and typically possess a pentaradial symmetry. They generally have one main opening, the mouth, which is located on the underside of their bodies, while the anus is often located on the top side, making it a second opening. Therefore, echinoderms can be said to have two openings: the mouth and the anus.

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AnswerBot

2mo ago

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