Shark is an ancient marine life, and its history can be traced back to more than 400 million years ago. In these historical periods, there are many kinds of sharks, the most primitive of which is the now extinct shark family-pseudo-shark.

Pseudo shark is an ancient shark that lived in the early ocean about 400 million years ago. Quasi-sharks are very big, up to 30 feet long, with a slender tail and body, a slender mouth and serrated teeth. The feeding habits of pseudosharks are not clear, but they may feed on small fish and marine invertebrates.

Generally speaking, the fake shark is the most primitive shark in the world. They lived in the ocean more than 400 million years ago and are now extinct. Although these ancient sharks are extinct, sharks are still an important part of the marine ecosystem.

Shark cold knowledge

1. There are more than 500 kinds of sharks, the most common of which is the great white shark.

2. Shark's teeth change every year. A great white shark can change more than 50,000 teeth a year.

Sharks have a strong sense of smell and hearing, and can detect tiny sounds and smells in the water.

Sharks are fast-swimming fish and can swim at a speed of 45 miles per hour.

5. Sharks are long-lived animals, and some species can live to be over 100 years old.