Use reasoning to answer the following question. Which has a unique water vascular system?\nOptions:\n- (A) roots\n- (B) trees\n- (C) Conifers\n- (D) Echinoids\n- (E) fur seals\n- (F) Most plants\n- (G) ferns\n- (H) bushes
User
Echinoderms have a unique water vascular system with tube feet. Another group of echinoderms are the echinoids. Echinoids have unique water vascular system was tube feet.
So, the answer is (D).
Assistant