They inhale oxygenated water through mouth while swimming. However, some sharks lacking a membrane roll their eye sockets back for protection. Denticles Tooth-like scales embedded in the skin. Paired lateral fins Pectoral fins of cartilaginous fish are paired laterally for efficient dive and lift control while swimming. In sharks, it often curves downward.
Sharks use their tail to move through the water.
Their dorsal and anal fins are used for stability. Pectoral fins aide in dive and lift control. The teeth are not attached to the jaw. A shark has many rows of teeth, which replace lost teeth by pushing them forward. The teeth of sharks are distinct to each species, making identification easier.