Multiple choice

Which of the following is not a characteristic feature of echinoderms?

  1. Calcium carbonate structures

  2. Water driven tube system

  3. Acoelomic cavity

  4. Triploblastic

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Echinoderms have a coelomic cavity (not acoelomic). The water vascular system (tube feet) is a key characteristic. They have calcium carbonate structures (ossicles/spicules) and are triploblastic. Acoelomate is a feature of flatworms, not echinoderms.