Echinoderms have a unique water vascular system with tube feet.
Echinoderms in the diorama include the crinoids and blastoids.
Blastoids have a unique water vascular system with tube feet.
What has a water vascular system with tube feet?
Options:
a) humans
b) blastoids
c) bushes
d) orchids
e) Most plants
f) ferns
g) bacteria
h) the Sun