How can a fierce-looking shark be described as a "soft bone"? What's going on?
Sharks are a very old animal that has been on Earth for hundreds of millions of years. As the top predator in the ocean, sharks have a fierce temperament and like to eat meat, so they are called "wolves in the sea".
However, although sharks look fierce, they are all "soft bones". The skeleton of a shark is made of cartilage, not bone. Cartilage is lighter and more elastic than bone, and helps sharks hunt their prey better. In some small coral reefs in the ocean, sharks can also swim in to prey on creatures that hide.
And this soft bone is also the shark's talisman. After the Cretaceous Period, many animals living on land became extinct, while sharks living in the sea survived. This is because the cartilage on sharks is lighter and more elastic than the hard bones of other animals. They are able to sink into the deep sea when the environment is unfavorable, and they can survive in the high-pressure environment of the deep sea.
It turns out that the so-called "cartilage" of the shark only refers to its soft bone, and it is not a boneless fish!
In fact, sharks dominate the ocean and have never really feared anyone. Except for humans, of course! Because the fins and bones of sharks can be made into expensive food and medicine, human beings hunt them wildly, and the number of sharks is greatly reduced. However, in recent years, various countries around the world have introduced regulations prohibiting shark hunting. For the sake of marine ecological balance, let's protect sharks together!