Question

What characteristic below is a defining feature of class Chondrichthyes?A. Cartilaginous skeletonB. Closed circulatory system with a two chambered heartC. Swim bladderD. Bony skeleton

Answer 1

The best option would be A. Cartilaginous skeleton

Members of the Chondrichthyes all lack true bone and have a skeleton made of cartilage. This class includes sharks, skates, rays, and chimaeras.