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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.
So many of us gaze at the stars in wonder when we should be looking into our oceans!. Shark skin is not made up of traditional fish scales. Rather, they have minature teeth similar to shark teeth in general that interlock (see the close up picture above). These scales are called dermal scales.