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Sharks - Skeleton. The skeleton of the shark has evolved and adapted to suit and aid the habitat, migration, hunting habits and diet of these acclaimed carnivores. Unlike terrestrial animals, humans, and even other marine animals, sharksâ skeletons are made purely of cartilage and connective tissue, or muscle. There is no bone. This type of skeleton means that the shark is lighter, as cartilage is about half the density of bone. This is important because, unlike other fish, the shark has no swim bladder to prevent it from sinking to the bottom of the ocean.
There are more than 400 different shark species, most of which can be found in coastal regions. They are present in every ocean of the world, with some species also inhabiting rivers. Sharks belong to the class of cartilaginous fish along side rays and chimeras.While the skeleton of all other fish is made of bone, the skeleton of sharks is made of cartilage. Cartilage is lighter and more flexible than bone allowing the shark to make tight turns quickly and to stay afloat.harks are a remarkably diverse group of fish. The largest species â the whale shark â can grow up to 12 meters in length while the smallest species â the dwarf lanternshark â only reaches a size of 17 centimeters.