Fact 1: Echinoderms have a unique water vascular system with tube feet.

Fact 2: Echinoderms in the diorama include the crinoids and blastoids.

Given the two facts above, answer the question "What has a water vascular system with tube feet?" with the following options: 
- humans
 - blastoids
 - bushes
 - orchids
 - Most plants
 - ferns
 - bacteria
 - the Sun


 

  blastoids       