(B) The water vascular system is a characteristic feature of the phylum $Echinodermata$. In echinoderms,a specialized excretory system is absent. The

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(B) The water vascular system is a characteristic feature of the phylum $Echinodermata$. In echinoderms,a specialized excretory system is absent. The excretory products diffuse out from the body tissues into the coelomic fluid,from where the waste is eliminated out of the body.