Let's think step by step! How do echinoderms use their feet to locomote themselves?\nOptions:\n- (A) one at a time\n- (B) to move people\n- (C) running and lifting\n- (D) protein channels\n- (E) a hydraulic system\n- (F) it needs them\n- (G) undulations\n- (H) It helps them survive
The thinking starts now:
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Echinoderms have a unique water vascular system with tube feet. Echinoderms have a hydraulic system of locomotion called the water vascular system. Echinoderms have a hydraulic system of locomotion with tube feet. The final answer: (E).
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