The Quiz: Which of these are close cousins of sharks?
B Electric eels
The lithe aquatic animals classified as Chondrichthyes, or cartilaginous fish, boast skeletons of bendy cartilage instead of bone. The group includes rays (‘Batoidea’ to marine biologists)—most of which feed off the ocean floor—as well as swifter predators like sharks and chimaeras.
The correct answer to this quiz is Rays.