What are the characteristics of shark teeth?

Unlike other animals in the ocean, shark's teeth are not permanent in a row, but have 5-6 rows. Except for the outermost row of teeth, the other rows are "supine", just like the tiles on the roof. Cover each other,

Once the outermost tooth falls off, the inner row of teeth will move forward immediately to make up for the cavity position that replaces the fallen tooth.

At the same time, shark's larger teeth have to be replaced by smaller ones in the process of growth. So sharks often have to change tens of thousands of teeth in their lifetime. According to statistics, a shark needs to replace more than 20,000 teeth in 10 years. There are more than 340 kinds of sharks in the world.

Sharks appeared 350 million years ago, but they kept all the features of prehistoric animals, such as soft bones and many cheeks on both sides of the jaw. In the deep sea, the average adult great white shark can reach 7-8 meters in length, and some can reach 12 meters, which is equivalent to the length of a bus. The biting force of great white sharks is 300 times that of humans, and they can easily bite their prey in half.

They are called man-eating sharks or man-eating sharks because they like to prey on humans and other animals. Great white shark is also a cartilaginous fish that scares people. The great white shark has a big mouth, teeth growing inward and small serrations on the edge. When its first row of teeth is worn out, it will grow a second row of teeth to supplement it.

Extended data:

Most sharks feed on marine animals such as fish. Sharks feed on injured marine mammals, fish and carrion, and destroy weaker members of animals. Sharks also eat garbage and other wastes left by ships.

In addition, some sharks prey on various marine mammals, fish, turtles, crabs and other animals. Some sharks can go without eating for months, and the great white shark is one of them. It is reported that great white sharks only eat once every month or two.

Great white shark is a predator who is good at camouflage. Great white sharks are not as flexible as other sharks because of their huge size. But the great white shark is an excellent hunter, because it can always surprise.

Its upper body is dark and its lower body is bright, so they can sneak up on their prey through this protective color. When it attacks from below, because its color is close to the deep sea, it will not be found before it attacks. It rarely attacks from above, but when it attacks from above, the white bottom is integrated with the bright sky reflected by the sea.

Sharks, known as mako sharks, mako sharks and sand fish in ancient times, are giants in the ocean, so they are called "wolves in the sea". Shark's nostrils are located in front of the ventral mouth of the head, and some nostrils have nose-mouth grooves, and the nose-mouth angles are connected. The folds of olfactory sac increase the contact area with the external environment. Sharks belong to cartilaginous fish and have no swim bladder. The regulation of ups and downs mainly depends on its big liver.

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