Which of the following would show pentaradial symmetry and have a calcareous endoskeleton made up of ossicles?

Step-by-step solution

Echinoderms have an endoskeleton of calcareous ossicles and, hence, the name Echinodermata (Spiny bodied). All are marine organisms with organ system level of organisation. The adult echinoderms are radially symmetrical (pentaradial), but larvae are bilaterally symmetrical. They are triploblastic and coelomate animals.