What are animals with no skeleton?

Sharks and Stingrays both do not contain any bones in their bodies. All invertebrates have no "bones". Vertebrates have "bones". Read a book on Biology. Sharks, dogfish and rays are all vertebrates but have skeletons composed of cartilage not bone.

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Wtf... Sharks have sharp, pointy teeth. What are teeth made out of? Bones! Sharks have bones.