Q: Fact 1: Echinoderms have a unique water vascular system with tube feet. Fact 2: All echinoderms are deuterostomes . Given the two facts above, what can have a water vascular system with tube feet?

(1). ducks
(2). peachleaf willow
(3). cats
(4). orchids
(5). Most plants
(6). horses
(7). animals
(8). deuterostomes
The answer is:
(8).