As you are walking along a beach, you find an animal and believe that it belongs to the class Asteroidea. Which of the following characteristics would support your hypothesis that the animal is a sea star and not another type of echinoderm?
A) It is pentaradially symmetric.
B) It feeds on other animals.
C) It has a hydrostatic skeleton, formed from its water vascular system.
D) Its central region is not well delineated from its appendages.

Question

Quizplus · Accepted Answer

Sea stars, belonging to the class Asteroidea, have a central disc that is not well delineated from their arms, unlike other echinoderms.

As You Are Walking Along a Beach, You Find an Animal