Modern science believes that all living things on the earth evolved from simple organisms, from the original single-cell organism to multi-cell organism , from multi-cell organism to marine organism , from marine organism to amphibian organism, from amphibian organism to terrestrial organism. Human beings evolved from terrestrial organisms. Human beings are the most intelligent life on the earth. Human beings have been constantly exploring the mysteries of the world since their birth. After thousands of years of technological development, human beings have now been able to go out of the earth to explore the universe, which shows that human science and technology development is still very fast. However, in the process of earth's biological evolution, organisms on the earth have experienced 5 mass extinctions.
The first mass extinction occurred 440 million years ago. This mass extinction event is called the Ordovician mass extinction event. Scientists speculate that this mass extinction may be related to the sudden cooling of the earth. Due to the sudden drop in the temperature on the earth at that time, a large number of sea water freezes. After the ocean freezes, many marine organisms were frozen to death. The second mass extinction of occurred 365 million years ago. Scientists believe that amphibian organisms had evolved on the earth at that time, and this mass extinction may be related to the eruption of the undersea volcano. After the eruption of the undersea volcano, a large number of magma erupted from the seabed, causing the temperature of the ocean to rise continuously, and many marine organisms were scalded to death.
The third mass extinction occurred 250 million years ago. Scientists believe that this mass extinction event is the most serious mass extinction event in the history of the earth, causing 96% of the organisms on the earth to become extinct. Scientists speculate that the cause of this mass extinction may be related to the movement of the continental plates. The fourth mass extinction occurred 200 million years ago. Scientists speculate that this mass extinction may be caused by the high oxygen content on the earth. Due to the high oxygen, it is very easy to cause fires, so many organisms may be burned to death by the fire. The fifth mass extinction occurred 65 million years ago. Scientists believe that an asteroid with a diameter of 10,000 meters hit the earth at that time.
After the asteroid hit the earth, it caused a large number of volcanoes on the earth to erupt. After these volcanoes erupt, thick smoke and magma were released. These thick smoke spread in the air for a long time and blocked the sunlight. Since the creatures on the earth did not have sunlight for a long time, many creatures died. At that time, the overlord on the earth was dinosaurs. Dinosaurs ruled on the earth for 160 million years. If the asteroid had not hit the earth, then the dinosaurs might still be alive until now. After dinosaurs extinction , humans began to be born. In order to study the causes of mass extinction of organisms, scientists have also made a lot of efforts. After scientists' research, it was found that most mass extinctions of organisms have a common characteristic.
That is, they will erupt a large amount of lava and toxic gases. " Proceedings of the National Academy of Sciences" " published in the past 540 million years. Four of the five largest cluster extinctions have been collectively extincted, all of which are related to the fires and magma produced. This research results confirm the suspicion of many geologists over the years. Take the asteroid impacted the earth 65 million years ago as an example. After research, scientists found that after this impact, the Earth had erupted for a long time for a long time in the last century, and it also left behind basalt , known as Decan dark. Scientists believe that long-term emission of sulfur dioxide will cool the earth, which will cause huge changes in the earth's environment, which is the main reason for biological extinction.
Among the organisms on earth, carbon dioxide has the greatest harm to organisms. Carbon dioxide can suffocate organisms, and carbon dioxide can block the sunlight. Through scientists' research on Venus, we can know that too much carbon dioxide will cause the earth's temperature to continue to rise. Although Venus is called the sister planet of the earth by scientists, the environment on Venus is very harsh. After research, scientists found that 95% of the atmosphere of Venus 1 are composed of carbon dioxide, which makes Venus unable to dissipate heat, so the temperature on Venus will become higher and higher. Currently, the temperature on Venus is as high as more than 400 degrees Celsius. In this high-temperature environment, no organism can survive.
. Earth's mass extinction events are basically related to thick smoke. Scientists investigated the igneous rock province, which refers to the igneous rock area containing more than 100,000 cubic kilometers of magma. These magma erupted at least 500 kilometers away, and some places can reach 2 kilometers thick. This is the important reason for biological extinction. According to the time of biological extinction, a biological extinction event will occur basically every 50 million years to about 100 million years. It has been 65 million years since the fifth biological extinction event. It may be the sixth biological extinction event. The earth's environment has changed now. I believe many of us can feel that the current earth's temperature continues to rise and the global greenhouse effect is serious.
Scientists believe that if it continues for a long time, the glaciers in the Antarctic and Arctic will all melt, and sea levels will rise by more than 60 meters, and all coastal cities will be submerged. In addition, Antarctic glaciers are the thickest, and after Arctic glaciers melt, the melting rate of Antarctic glaciers will accelerate the melting rate of Antarctic glaciers. Why do you say that? Because the Arctic glaciers are all white, white can reflect the heat of sunlight. If the Arctic glaciers are all melted, the heat of sunlight will be absorbed by the earth, thereby accelerating the melting of Antarctic glaciers. Scientists have calculated that in about 1,000 years, all glaciers in the Antarctic and Arctic will melt.
How should humans deal with it then? Now scientists have discovered ancient viruses under glaciers. These ancient viruses have not died, but have been frozen. If the glaciers melt, these viruses will wake up, which is a huge threat to the creatures on earth. Therefore, humans should be alert. If the sixth mass extinction comes, can humans survive? Although humans are the wisest life on Earth, humans also seem very small in the face of natural disasters. If humans want to develop in the universe for a long time, we must immigrate to other planets in the future. At present, scientists have discovered planets similar to Earth in the universe. However, these planets are too far from the Earth, and humans cannot fly out at present. With the advancement of human technology in the future, we may be able to immigrate to other planets. Do you have anything to say about this?
