Read the features given below and select the option for animals which correctly describes the features mentioned: I. All are exclusively marine, triploblastic, coelomate organism with a water vascular system. II.A small group of worm-like marine animals with the organ system levels of the organization. III. The body is covered by a calcareous shell and is unsegmented with a distinct head, muscular foot, and visceral

Step-by-step solution

Echinodermata are the exclusively marine, triploblastic, coelomate organisms with a water vascular system ( Asterius, ophiura ). In Mollusca body is covered by calcareous shell and is unsegmented with a distinct head, muscular foot, and visceral hump (Pila, Sepia). Hemichordates are a small group of worm-like marine animals with organ system level of organization (Balanoglossus, Saccoglossus). Triploblastic, pesudocoelomate animals in which alimentary canal is complete with a well developed muscular pharynx is seen