Carcharodon Carcharias- Shark
The skeleton of a shark is mainly cartilage. The sharks have at least 230 bones. Cartilage is flexible and durable, yet has about half the density of bone. This reduces the skeleton’s weight, saving energy. The shark has no rib cage, therefore on land a shark can crush itself. Shark teeth are embedded in the gums rather than directly affixed to the jaw. They are constantly replaced throughout life. Multiple rows of replacement teeth grow in a groove on the inside of the jaw and steadily move forward as in a "conveyor belt". Sharks can lose 30,000 or more teeth in their lifetime. The rate of tooth replacement varies from once every 8–10 days to several months. GWS have needle-like teeth for gripping, and those that feed on larger prey such as mammals have pointed lower teeth for gripping and triangular upper teeth with serrated edges for cutting. Shape of the tooth depends on their diet.