Class Chondrichthyes - Cartilaginous Fish. Imagine ... Like other fish skeletons you've seen, you'd expect a rib cage and hard bones to reveal themselves as the animal decayed. Yet sharks ... They are also produced in an organ called Leydig's Organ which is only found in cartilaginous fishes (although some have lost it). read more
Got another brighter idea , like farting with your brother holding a lighter to your ass . read more
Sharks are primarily saltwater fishes, but some, like the bull shark, can be found in freshwater. Skates and Rays: Batoidea suborder There are four living orders of rays that compose the suborder Batoidea. read more