5 mass extinctions first originated from a research report in the Science Journal in 1982. However, what the original author said was the five mass extinctions since Cambrian , but it was misinterpreted during the spread.
These five biological extinction events are the Ordovician biological extinction, the Devonian biological extinction, the Permian biological extinction, the Triassic biological extinction, and the Cretaceous biological extinction. They all occur at the end of each "center" or the transition period with the next "center", and each time causes more than half of the species on the earth to disappear.
In fact, there have been no less than 10 biological extinction events on Earth, and there are countless other small extinction events.
Fossil evidence shows that the earliest and most primitive life on Earth was born about 3 billion years ago. Life has appeared for more than 3 billion years. How could there be only 5 mass extinctions in the world? For example, the major oxidation event of , which occurred about 2 billion years ago, and several snowball earth events, have caused huge species extinctions.
According to scientists' division of geological history, the five mass extinction events were distributed in Phantom .
Phaeozoic is the last major period in geological history, including the Paleozoic, Mesozoic and Cenozoic. Human beings are now in the Cenozoic period. Before the Phaezosphere, there were Protozoology and Archezoology . The Phanomiano began in the early Cambrian period 540 million years ago. The Cambrian period was a period in geological history, about 540 million to 490 million years ago. During this period, the famous Cambrian life explosion occurred.
6500 years ago the extinction of dinosaurs is a microcosm of the Cretaceous mass extinction incident and is also the most well-known biological mass extinction incident in the public.
The scientific community generally believes that the extinction incident was caused by an asteroid with a diameter of about 4 kilometers and hit the earth, which is the most supported view at present. The impact crater is near what is now the Yucatan Peninsula in Central America and is called the Suxiruber Crater. Of course, this asteroid impact on Earth may not directly cause all dinosaurs on Earth to become extinct, but the subsequent climate impact is indeed the main reason for the extinction of dinosaurs .
There is no unified conclusion about the causes of the other four biological extinction events. After all, they all happened hundreds of millions of years ago. It is too far away in terms of time. After hundreds of millions of years of changes, it is difficult to figure out what happened at that time? There are only a few views that
leads to mass extinction. Either it is caused by a large asteroid or comet hitting the earth, or it is caused by a supervolcano (group) eruption on the earth, or the earth has encountered a large ice age, and other factors that may change the entire earth's climate environment.
In short, the earth's climate environment has undergone tremendous changes, which ultimately led to the extinction of most species. It can also be seen from this: "Why are scientists worried about the global warming of now?
Some people say that humans are leading to the 6th mass extinction of the Phanerozoic universe. I don't agree with this statement. I just want to ask: "So far, has humans caused nearly half of the species on the earth to disappear?"
Survival of the fittest. Species extinction events occur every day on Earth, which is an inevitable phenomenon in the evolution of life. Although human activities have squeezed the living space of other species on the earth and aggravated the extinction rate of species on the earth, the extinction of species on the earth is not all for humans. In fact, humans are also a species on Earth, but because they are too successful, they have had a huge impact on the evolution of other species.
Follow me and let you gain knowledge.
