Some sharks even eat swordfish. Sharks do not have bones. They have cartilage. Cartilage is a rubbery lightweight material. A shark's spinal column is made stronger with calcium layers.
Sharks have at least five rows of teeth.
They have very sharp teeth. Some can even slice through a turtle shell. Usually a shark loses one to two teeth at a time. Sharks keep getting new teeth all their lives. Outside and Inside Sharks , Sandra Markle 2.