What are the 5 mass extinctions in history? What creatures were destroyed

When it comes to mass extinctions on Earth, we often think of the dinosaur extinction 65 million years ago. But since the birth of the earth, in addition to the mass extinction of dinosaurs, the earth has experienced several mass extinctions.

Categories: Science & Engineering.

Analysis: The First Mass Extinction:

Event: Caused the extinction of approximately 80% of the species.

The Second Mass Extinction:

Event: Marine life has been wiped out.

The Third Mass Extinction:

The Fourth Mass Extinction:

Event: The fourth mass extinction occurred, with reptiles suffering a major blow.

The Fifth Mass Extinction:

Event: Suddenly, the dinosaurs that had ruled the Earth for so long since the Jurassic became extinct.

Event: The unbridled misuse of nature by the flourishing of humanity has led to a dramatic decline in the world's species.

Correction of a number of errors and typos.

There were five extinction events in history, namely: Ordovician-Silurian extinction event, Late Devonian extinction event, Permian-Triassic extinction event, Triassic-Jurassic extinction event, and Cretaceous-Tertiary extinction event.

1. Ordovician-Silurian extinction event.

It occurred in the late Ordovician or the transitional period between the Ordovician and the Silurian period, from 100 million to 100 million years ago, and about 27% of the families and 57% of the genera became extinct.

2. Late Devonian extinction events.

From 100 million years ago to 100 million years ago, it was close to the Devonian-Carboniferous transition period. This time it was mainly the extinction of marine life, and the impact on terrestrial life was not significant. About 19% of families and 50% of genera are extinct.

3. Permian-Triassic extinction events.

It occurred during the Permian-Triassic transition 100 million years ago. This is the largest extinction event in known geological history. Many entire orders or suborders of animal phyla were wiped out in this extinction event.

4. Triassic-Jurassic extinction events.

The Triassic-Jurassic transition period 100 million years ago. About 23% of the families and 48% of the genera are extinct. The reasons for this are inconclusive.

5. Cretaceous-Tertiary extinction events.

65 million years ago, about 17% of families, 50% of genera, and 75% of species went extinct. This extinction event was rated as the second of the five mass extinction events, after the Permian-Triassic extinction event. The cause is generally believed to be a meteorite impact on the Yucatan Peninsula in Mexico.

The horseshoe crab is a peculiar marine creature. It appeared in the Paleozoic era in geological history, when dinosaurs were not the overlords of the earth and primitive fish were just being born. With the passage of time, other animals have continued to evolve or become extinct, but only the horseshoe crab, which has maintained its most primitive appearance for more than 400 million years, is called a "living fossil".

It once lived with trilobites in an era and experienced 5 mass extinctions.

Living horseshoe crabs are more than 200 million years old on Earth, and their morphologically similar ancestors date back 400 million years. There are only four species in existence, namely the American horseshoe crab that lives on the east coast of the Americas, and the Chinese horseshoe crab, the southern horseshoe crab and the roundtail horseshoe crab that live on the southeast and east coasts of Asia. Among them, Chinese horseshoe crab and round-tailed horseshoe crab were once distributed along the southeast coast of China.

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The mass extinction of secondary organisms:.

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The First Mass Extinction:

According to scientists, there have been five mass extinctions on Earth. Different extinctions, representing different periods on Earth, each of which has some exclusive animals. The five mass extinctions were the Ordovician mass extinction, the Devonian mass extinction, the Permian mass extinction, the Triassic mass extinction, and the end Cretaceous mass extinction of the dinosaurs.

One of the most impressive should be the mass extinction of dinosaurs, and there are many anime and movies about dinosaurs now.

1. The first two mass extinctions were in the Ordovician period, when there was almost no land life and even the ozone layer was not fully formed. Most life lives at the mouth of the ocean's hot springs, and almost all life is inseparable from water. However, at that time, the invertebrates of the ocean were quite prosperous, and they were the first generation of overlords on the earth, although they did not occupy land, but they were relatively numerous.

Unfortunately, the global temperature has cooled, and the Great Ice Age and Interglacial Period have wiped out most of the living things. The second time was the Devonian, this time the overlords of the earth were fish, some plants and animals began to move towards land, amphibians and vertebrates appeared. The extinction is said to have been caused by a volcanic eruption, and the boiling waters of the sea killed many creatures.

2. The third and fourth third are known as the Permian mass extinction, when the largest number of species disappeared from the planet, more than 96%. At present, there is no reasonable explanation for this extinction. However, scientists have found that there was a lot of geological activity during the Permian, ** and volcanic eruptions were common, and the extinction of life was related to this.

The fourth was the Triassic Mass Extinction, when the Earth's overlord had turned into a reptile, and the land had high oxygen levels and many giant plants and animals appeared. Unfortunately, the sudden change in oxygen and the rapidly decreasing oxygen levels have left these plants and animals facing death.

3. The fifth and fifth is the mass extinction of dinosaurs at the end of the Cretaceous period, many people know that they are the real land overlords. There are many reasons for extinction, such as natural disasters, meteorite impacts, etc., and there are many different theories. Of course, there have been many overlords on Earth, such as Homo erectus, whose brains developed rapidly, making them known as the most fearsome predators on land.

The earth has experienced a total of five mass extinctions, and if humanity perishes, who will be the next ruler?

The Fifth Mass Extinction was about 6 million species extinction, and about 75%-80% of species were extinct at that time.

The fifth mass extinction was the second largest mass extinction event in the history of the Earth at the end of the Cretaceous period, 65 million years ago, with about 75%-80% of species extinct. Of the five mass extinctions, this one is the most famous, famous for the billion-year-long age of dinosaurs that ended here, and the ammonites from the oceans disappeared along with it. Its greatest contribution was to eliminate the dominant dinosaurs and their cousins on the planet, and to provide an opportunity for the final appearance of mammals and humans.

This catastrophe came from extraterrestrial space and volcanic eruptions, and one or more meteorite showers that occurred at the end of the Cretaceous period caused the collapse of global ecosystems.

The fifth mass extinction originated at the end of the Cretaceous period 65 million years ago, and was the second largest mass extinction event in the history of the earth, with about 75%-80% of species extinct.

The five extinction events on the earth all had the same cause, all of which were due to the shift of the earth's center of gravity, which led to a large shift in the earth's poles. The center of gravity of the Earth is not concentric with the center, but is located south of the center. The position of the two centers determines the position of the earth's axis, and the distance between the two centers determines the angle of inclination of the earth's axis.

The position of the Earth's center of gravity is not eternal, but can change due to melting glaciers or asteroid impacts. The change in the center of gravity leads to a shift in the Earth's axis, a large shift in the Earth's poles. The great shift of the earth's poles, the reversal of the earth's rotation, the change of the earth's latitude and longitude, the change of ocean current circulation and atmospheric circulation, the redefinition of land and sea, the great change of the global environment and climate, the death of all plants on the earth, the inability of new plants to meet the needs of animals, and the breakage of the food chain, leading to the extinction of life on earth.

The fierce debate in the scientific community is whether the Earth is entering yet another mass extinction. Currently, the world is in the Holocene epoch, and plants and animals are dying at an extraordinary rate and with life, because we know that it is in danger. However, this time it wasn't volcanic activity or an asteroid impact.

Human activities are triggering global climate change, with species extinction rates increasing to 10 to 100 times the norm. The evidence is clear that we are heading for the sixth mass extinction.

The five mass extinctions on Earth are all for the renewal of the Earth, just like clothes. Clothes will get dirty after a long time, they will be old, they will be dirty, and you need to wear new clothes.

Life sometimes fades away, and buildings sometimes perish. Anything has its timing. So is the Earth. It cannot change the program designed by the designer and is periodically destroyed.

Because the creatures on the earth are not protecting the earth but have been destroying the earth, and the earth has been destroyed by the creatures and cannot be restored. Only with a new one will everything start again.

Life on Earth has undergone five mass extinctions since its inception. The Cretaceous mass extinction directly led to the extinction of 75%-80% of the earth's species, including dinosaurs. But the surviving little mammals have been successfully resurrected, which is why humans came relatively late.

Biology divides organisms into seven categories from top to bottom: world, phyla, class, order, family, genus, and species. Extinction often means the disappearance of entire families, orders, and even classes in a short period of time.

Species extinction can be called the great selection mechanism of life on Earth. The species that survive each extinction will continue to reproduce and then experience the next extinction, and then most of the species will be screened out and the surviving species will reproduce again.

Nature was the extinction of the dinosaurs. The most terrible thing about the extinction of the dinosaurs is that in a short period of time, the volcano erupted, and none of the dinosaurs survived.

It was probably the third mass extinction that was the worst, resulting in the extinction of more than 95% of all living things, and this mass extinction gave birth to the biological world, giving way to new species and renewing ecosystems.

Five times. The first mass extinction: the Ordovician mass extinction.

Event: Caused the extinction of approximately 85% of the species.

The second mass extinction: the Devonian mass extinction.

Event: Marine life has been wiped out.

The Third Mass Extinction: The Permian Mass Extinction.

Event: Caused the extinction of more than 95% of Earth's life.

The Fourth Mass Extinction: The Triassic Mass Extinction.

Event: The fourth mass extinction occurred, with reptiles suffering a major blow.

The Fifth Mass Extinction: The Cretaceous Mass Extinction is also known as the Dinosaur Mass Extinction.

Event: Suddenly, the dinosaurs that had ruled the Earth for so long since the Jurassic became extinct.