Why do sharks have no bones but if you search “shark skeleton” there’s diagrams?

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Why do sharks have no bones but if you search shark skeleton there’s diagrams? And wouldn’t shark teeth be considered bones?

In: Biology
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Sharks have skeletons made of cartelage, so not bones. And teeth aren’t made of bone either.

Sharks have a cartilage skeleton, so there’s still a structure but it’s not made of bones. Their teeth are scales I think.

You can have a skeleton without having “bone”. Insects have skeletons of chitin. Shellfish have skeletons made of calcium carbonate.

Sharks use cartilage, reinforced with calcium, but still not bone.