A new statement about the origin of mankind!

Where do we come from? The theory of the origin of human life has always been a controversial issue in the scientific community.

According to the latest issue of New Scientist magazine, life on earth may have originated in freshwater ponds, rather than near deep-sea heat sources, which is generally believed in academia. It is reported that researchers at the University of California, Santa Cruz believe that fresh water is more likely to breed life than salt water. They said: "Although the oldest known fossils belong to marine life, life actually originated in freshwater ponds."

Scientists believe that the first step in the origin of life is that self-replicating chemicals-which later developed into DNA-are surrounded by a thin film called bubbles. Charles Appel, in cooperation with his colleagues, has been able to make such bubbles in fresh water by using the material components of the early earth, but the same result cannot be obtained in a salt water environment.

According to the report, the research results question the theory of ocean origin, but it is somewhat similar to Darwin's theory. A century ago, Darwin speculated in his personal letters that life originated from "a small pond rich in organic salts of ammonia and phosphorus, light, heat, electricity and other related substances." After the formation of human life, most scientists agree that human ancestors originated in Africa, but hold different opinions on the development process of human beings after they first left Africa. American scientists recently put forward a new viewpoint of human evolution, thinking that human beings have gone out of Africa three times.

The scientific community generally believes that about 2 million years ago, Homo erectus, the ancestor of modern human beings, appeared on the historical stage and began to expand from Africa to all parts of the world. This is the first time that mankind has walked out of Africa. It has been suggested that after Homo erectus left Africa, modern people rose in different parts of the world. However, some people think that about 50 thousand years ago, another group of people went out of Africa, completely replacing the early residents of Eurasia. Allen templeton, a scientist at the University of Washington in the United States, suggested that both of the above viewpoints may have some truth, and the fact may be somewhere in between. African immigrants in the later period had a great influence on human genetic characteristics, but they realized it in the form of intermarriage, rather than completely replacing the original residents by force.

Templeton reported in the latest issue of the British journal Nature that he studied the DNA sequences of residents in different parts of the world, combined the information of 10 region on autosome, sex chromosome and mitochondria, compared the differences of multiple genes and studied their mutation process. He concluded that after Homo erectus left Africa, there was another large-scale African migration wave 400,000 to 800,000 years ago, and the third time occurred about 654.38 million+years ago. He also found a tendency to return to Africa from Asia. Some scientists support Templeton's view. However, some people are skeptical that his chromosome analysis method is flawed. Some archaeologists say that there is a lack of archaeological evidence consistent with it. However, another important discovery has made a better annotation for mankind to go out of Africa, because scientists have found that a Greek woman and Native Americans have the same ancestor, and the ancestor "Eve" traced back to mankind may be African black!

The special program "The Real Eve" of Discovery Channel traces the whole process of human blood relationship, just like a living science detective story. The world's top scientists, through cutting-edge scientific and technological research, have proved that part of human mitochondrial DNA today is the same as that of an African woman 6.5438+0.5 million years ago. This African woman named Eve was not the only one at that time, but she had the only surviving and most successful mitochondrial DNA. Mitochondrial DNA provides chemical energy and is an indispensable genetic gene for determining height and pupil color. Through the most advanced DNA research, some scientists have boldly subverted the original view of human global migration, believing that the formation of global population is the result of African ancestors entering Asia southward.