Question: Where do all adult echinoderms live?
Options:
- (A) soil
- (B) desert
- (C) freshwater
- (D) fossils
- (E) water
- (F) Earth
- (G) small
- (H) aquariums
Let's be accurate as possible and think step-by-step.
Adult echinoderms have radial symmetry. All animals with radial symmetry live in water. All adult echinoderms live in water.
The answer: (E).