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 feeds on other animals. b. It has a hydrostatic skeleton, formed from its water vascular system.c. Its central region is not well delineated from its appendages.d. It is pentaradially symmetric.