Хрящовий скелет акули | A shark’s cartilaginous skeleton

A shark’s skeleton is made primarily of cartilage rather than bone. That does not mean it is soft or unsupported: cartilage in the vertebrae, jaws, and around the brain can be partly mineralized. However, the claim that cartilage makes up about 60% of a shark’s body weight is not supported by reliable sources and may confuse the mineralized fraction of the skeleton with the mass of the entire skeleton. Exact skeletal mass depends on species and size, so it is safer to describe the material rather than repeat an unsupported percentage.