Unlike humans, they have no bones since their skeleton is made up of cartilage. In addition, according to the information by the Internet, they renew their teeth whenever they lose one. Sharks have a special valve inside their intestine that looks like a spiral staircase on its side, these valves help sharks digest food. Shark's skin looks and feels like tiny teeth called denticles. Their skin is sometimes used as sandpaper.
All sharks are carnivores, they hunt for different animals.
The Benthic sharks hunt animals that lives on the ocean floor including sea urchen, clams, and crabs. Sharks are really terrific to learn about, one of the fascinating facts about sharks is the way in which they detect their prey. According to the Internet Informations on sharks, the most important sense that sharks use in detecting its prey is by sound. It's been said that their acute hearing can detect a struggling fish 2km away. Sharks can also detect sound with their lateral line system.