Select the distinguishable characters of ophiura from balanoglossus.

Step-by-step solution

Echinodermata are triploblastic and coelomate animals, characterized by the presence of endoskeleton made up of calcareous ossicles, water vascular system, radial symmetry e.g., asterias (starfish), echinus (sea urchin), antedon (sea lily), cucumaria (sea cucumber) and ophiura (brittle star). Hemichordates are a small group of worm-like marine animals with the organ-system level of organization. They are bilaterally symmetrical, triploblastic, and coelomate animals. The body is cylindrical and is composed of an ant