You are presented with the question "What has a water vascular system with tube feet?" and the following answer choices: 
- humans
 - blastoids
 - bushes
 - orchids
 - Most plants
 - ferns
 - bacteria
 - the Sun

Now knowing that echinoderms have a unique water vascular system with tube feet and echinoderms in the diorama include the crinoids and blastoids, choose the best answer.


 

  blastoids       