Fish that have been extinct for at least 65 million years, why have they reappeared on Earth?

The reason for the recurrence is that China's environmental protection is very strong, and to a certain extent, they have returned to their original living conditions, so that this miracle will occur.

The atavistic phenomenon, all living things have their ancestors' genes, because of the environment, there is a high probability of atavism.

Because there is a repetition of evolution in nature, that is, extinct organisms evolve again, so fish, which have been extinct for at least 65 million years, have reappeared on the earth.

Summary. Hello dear, the shark extinction lasted 10 million years 19 million years ago. Sharks ruled the oceans for about 40 million years, and they were 10 times more numerous than they are today.

But 19 million years ago, sharks appeared to have experienced an unprecedented mass extinction event, with more than 90% of sharks going extinct, and they never recovered.

Hello dear, the shark extinction lasted 10 million years 19 million years ago. Sharks ruled the oceans for about 40 million years ago, and they were 10 times more numerous than they are today. But 19 million years ago, sharks seemed to have experienced an unprecedented mass extinction, with more than 90% of sharks wiped out and never recovered.

As we all know, shark bones are mostly made up of cartilage, so special conditions are needed to preserve them. But teeth are made up of a tougher material called dentin, which is even harder and denser than bone, so teeth are not only the most common part of sharks, they are also one of the most common fossilized trousers in any living organism. However, compared to other animal fossils, shark tooth fossils are small and relatively rare, after all, most of them are found in sediments on the seafloor.

The results showed that 1 in 5 fish fossils was a shark scale 19 million years ago, suggesting that the marine stove was once full of sharks. But since then, only one shark scale has been found for every 100 fish fossils. And this change was sudden, and the time of the fierce argument was less than 100,000 years.

This means that the shark basically disappeared "overnight".

Will it last 10 million years or 100,000 years?

10,000,000 years.

What does 100,000 years mean?

It was 100,000 years ago.

This means that 1 out of 100,000 fossil carcasses 100,000 years ago was a shark.

What other animals on land were going extinct 19 million years ago?

The current information shows that the shark is greatly affected.

All kinds of records are sharks kissing.

Extinction that lasted for 10 million years is also called overnight? Is it 100,000 years or 10 million years? Say it well.

10 million years of kissing.

A lot of data can't be verified, and now humans can only infer that a lot of data is inferred.

We don't know what happened 100,000 years ago, but we can only test the existing survey data.

In the history of biological evolution, there have been a total of 6 mass extinction events.

The First Mass Extinction:

The first mass extinction occurred about 100 million years ago, in the late Ordovician period, when 85% of the organisms disappeared in this battle, representing the organisms cephalopods and trilobites;

The Second Mass Extinction:

The second mass extinction occurred in the late Devonian period 100 million years ago, and it is estimated that about 19% of families and 50% of genera disappeared after this extinction event.

The Third Mass Extinction:

The third mass extinction event occurred between the Permian and Triassic periods 100 million years ago, which was the largest extinction event in history, causing the disappearance of 80% of terrestrial life and 96% of marine life, and the only mass extinction of insects. If only the number of extinct species is counted, this is the largest extinction event in history.

The Fourth Mass Extinction:

The fourth mass extinction event occurred about 200 million years ago, this extinction event caused the loss of about 50% of species, this time between the Triassic and Jurassic extinction events, it was this event that made the dinosaurs rise from then on to become the overlords of the earth.

The Fifth Mass Extinction:

The fifth mass extinction is probably the most familiar to all people with a mass extinction event, the event occurred 65 million years ago, in this mass extinction event all non-avian dinosaurs were extinct, and not only that, and the dinosaurs of the same era of large reptiles such as pterosaurs, ichthyosaurs, and cantosaurs were extinct together, this mass extinction event, so that mammals on the stage, began to ascend to the position of world hegemon.

The Sixth Mass Extinction:

As for the sixth mass extinction event, it is actually happening now, and this mass extinction is still going on, but the scientific community has not yet recognized this mass extinction. The reason for this mass extinction is related to human beings, since the emergence of human beings, the rate of disappearance of living things, there are studies that exceed several mass extinctions of living beings in history, but with the footsteps of human beings, mammoths, earth otters, moa, ancient monitor lizards and other creatures have disappeared and become extinct. However, mankind has realized the seriousness of biological extinction, and whether the last biological extinction can really become a mass extinction event depends on its subsequent development.

The first mass extinction was 100 million years ago, cephalopods and trilobites, the second mass extinction was 100 million years ago, part of the family and genus disappeared, the third mass extinction was 100 million years ago, 80% of terrestrial life and 96% of marine life disappeared, the fourth mass extinction was 200 million years ago, the birth of dinosaurs, the fifth mass extinction was 65 million years ago, and non-avian dinosaurs were extinct.

Five mass extinctions. If there is a sixth mass extinction in the future, it may be caused by human beings themselves, because human beings have not protected the earth, making the earth's environment worse and worse, and the world is already warming.

The earth has been 4.6 billion years old, and according to scientists' statistics, there have been five mass extinctions on the earth from ancient times to the present, namely the Ordovician mass extinction 100 million years ago, the Devonian mass extinction 100 million years ago, the late Permian mass extinction 100 million years ago, the Triassic mass extinction 100 million years ago and the dinosaur mass extinction 65 million years ago.

There have been a total of 6 mass extinctions in the past, and each mass extinction has been very long, and many creatures have disappeared when they become extinct.

6 times, after each extinction event, there will be a different kind of extinction of life, resulting in the extinction of many species on the earth today.