why sharks do not have bones

Question

Every other fish I can think of has bones but sharks do not. Why is this?

In: Biology

Answer 1

It’s not true that every other fish has bones. There are fish with bones (bony fish) and cartilaginous fish. Other cartilaginous fish include, rays and a kind of fish known as a chimaera. They are estimated to have diverged from what would become bony fish about 420 million years ago.