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Sharks actually do form some types of calcified tissues, such as their teeth, so they do have the ability to form bone. Fishes are vertabrates because they have bones remember, this causes fossils. Their skeletons are made mostly of cartilage and not actual bone, being of a more ancient classification of fish in.

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Without jaw bones sharks would not be able to survive because they would not be able to eat.

Sharks do have backbones, making them vertebrates.

They also do not have a swim bladder like bony fish, just an oily liver to aid in buoyancy. Then why don't they form bone for their whole skeleton? A shark's skeleton is different because it is cartilage instead of bone, but sharks do have spines. Sharks do lack real bones except for in there jaw.

Cartilage is found in a human's ears and nose. The bones of a shark are not really bones at all. They are made of cartilage. Sharks belong to the chondrichthyes class which means that they lack what is called true bone.

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Sharks differ from other fish as they have no bones, only cartilage.

All fish are vertebrates and they have backbones. Their skeleton is made up of cartilage, which is the same as the human. Cartilage is flexible and lighter than bone, which helps these animals stay.