2020-09-11

Biological reappearance 550 million years ago? Scientists:The truth about the Cambrian life explosion may be made public

By yqqlm yqqlm

Scientists believe that the earth was born 4.57 billion years ago. British biologists said on March 1, 2017 that the oldest fossil was found in Canada, showing that life existed about 4.3 billion years ago, which proves that the emergence of life on earth is greater than the previous recognition of human beings. Earlier. Since ancient times, scientists have been exploring how life is formed? What do ancient creatures look like? When did life form? And all of this is still under study.

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The biological reappearance of the human world 550 million years ago

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Recently, the early life research team of the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, in collaboration with American scholars, found that four species are about 10 cm in body length in the Shibantan biota in the Three Gorges area of ​​Hubei, China. Ancient creatures shaped like leaves. Unlike the leaves that really grow on branches, these”leaves” are actually peculiar early animals that lived at the bottom of the ancient ocean. Scientists say that these”leaves” have no mouth and anus, so they have no digestive system. There are circular suction cups at the bottom. They are adsorbed on the seabed by suction cups. The”stems” and”leaves” of the”leaves” stand upright in the sea. . Researchers speculate that they absorb small organic particles in the sea water for a living during the rocking process.

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Scientists say that this organism appeared 550 million years ago It is helpful to study the composition and characteristics of organisms in the Cambrian period, and also helps to understand the truth of the life explosion in the Cambrian period.

What is the Cambrian explosion of life?

The origin of life on earth can be roughly divided into these stages:

The Archean (3.8 billion to 2.5 billion years ago):The lowest primitive organisms are produced

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Precambrian-Cambrian-Ordovician-Silurian (2.5 billion to 410 million years Before):The age of marine invertebrates

The Devonian (410 million years-350 million years ago):The Fish Age

Carboniferous-Permian (350 million years- 250 million years ago):Amphibian era

Triassic-Jurassic-Cretaceous (250 million years ago-70 million years ago):Reptile era

Cenozoic (7000 years ago to present:) Mammal Era and Human Era

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Before the Cambrian period (530 million years-542 million years ago), there were almost only the most primitive algae, trilobites and other lowest ancient creatures on the earth, but in the Cambrian period only a few million years Numerous invertebrates suddenly appeared inside. But in the earlier and more ancient strata, no obvious ancestral fossils have been found for a long time. The sudden emergence of this creature is called the”Cambrian Life Explosion” by paleontologists.

Does life originated from the earth or outside of the earth?

The necessary condition for the formation of life is water. Whether the earth is the only planet with life in the universe is still a mystery. American astronomer Travis Barman said that he discovered the presence of water vapor on a gas planet numbered HD209458b. The planet is about 150 light years away from the earth. At the beginning of this year, my country’s”Long March” cosmic probe sent back pictures showing the existence of liquid water in the”Xuesen Star” at the edge of the Milky Way Galaxy. This is the first time that liquid water has been discovered besides the Earth.

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Is there any Maybe life originated outside the earth and then spread to the earth through some medium? On the International Space Station (ISS), Japanese scientists placed dry particles of bacteria called Deinococcus radiodurans on a panel outside the International Space Station and exposed them to the cold, high-radiation space vacuum. After a few minutes, the researchers analyzed the aggregates. In the end, all particles with a thickness of more than 0.5 mm showed at least partial survival. After careful observation, the researchers discovered that the colony survived because individual bacteria outside died due to exposure, forming a protective shell for other bacteria. This research provides a basis for the idea that life can travel between planets.

However, no matter where life originated, it can develop to the present level of complexity and diversification due to the evolution of life. As human beings, we should not only be curious about its origin, but should also care about the future of life on earth and the future of the earth!