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Special adaptation
The skeleton of sharks, as bezżuchowców skeleton is made of cartilage. Sharks do not have bladder pławnego and had stopped to swim, opadłyby to the bottom. Representatives of some species of sharks spend most of their time at the bottom of the sea. There are also those at the bottom of the sea just rested. Oxygen-containing water enters through the gills located around the eyes with holes called tryskawkami. If the water was hauled in by oxygen gębową cavity, would be contaminated with sand or mułem. The body of the shark, just like any other fish chrzęstnoszkieletowych, is covered with so-called plakoidalnymi scales. These hulls are built with zębiny, in the middle where the cavity and nerves, which recalls the construction of the teeth of vertebrates on land. Shark teeth are transformed scales plakoidalnymi.