SHARKS Sharks, any of several fast-swimming, generally large fish known for their many sharp teeth, distinctive dorsal fin, and skill in locating underwater prey. Like other fishes, sharks are generally cold-blooded and breathe with gills. But unlike the more common bony fishes, which have skeletons made of rigid bone, sharks and their relatives skates, rays, and chimaeras have flexible internal skeletons made of cartilage.Among the most ancient vertebrates in the sea, ancestors of modern …showed first 75 words of 3061 total…

…showed last 75 words of 3061 total…Cetorhinidae, and is classified as Cetorhinus maximus. The megamouth shark makes up its own family, Megachasmidae, and is classified as Megachasma pelagios. The cookie-cutter shark is a member of the luminous shark family, Dalatiidae, and is classified as Isistius brasiliensis. The horn shark belongs to the horn shark family, Heterondontidae, and is classified as Heterodontus francisci. Bibliography Colliers Encylapedia p.358 The New Book of Knowlage p. 255 Hannekans Book of Fish p. 105 by. J.D woodland