Where do all adult echinoderms live?\nOptions:\n- (A) soil\n- (B) desert\n- (C) freshwater\n- (D) fossils\n- (E) water\n- (F) Earth\n- (G) small\n- (H) aquariums
Step-by-step reasoning:
(E)
Adult echinoderms have radial symmetry.

All animals with radial symmetry live in water.

All adult echinoderms live in water.

.

So, the final answer is (E)