Echinoderms have a unique water vascular system with tube feet.
Echinoderms are represented by the starfish.
Starfish have a unique water vascular system with tube feet.
What kind of animals has a water vascular system with tubed feet?
  - animals
  - starfish
  - reeds
  - insects
  - warm-blooded
  - sponges
  - sea coral
  - four limbs