The earth is a beautiful planet of life, with more than millions of kinds of life, among which mammals are the mainstream of the biological world, and humans are also advanced mammals. Although mammals have become the protagonist of the world, but there is a regret that there is a limit of life, can not live longer, or even immortality.
I believe many people have expectations for immortality and immortality. Many emperors in ancient times had the dream of immortality. However hard they tried and how powerful their power was, they could not escape the fate of being taken away by death. Perhaps in the eyes of many people, the law of life and death of life is the eternal law of the universe, and no life can escape.
However, through the exploration and understanding of life on earth, scientists have found that there is a kind of life that can be immortal in theory. These are microbes that we can’t see with the naked eye, such as bacteria and viruses, and human cancer cells. Theoretically, they can live forever.
Why can these microbes achieve immortality, but the more advanced creatures can’t? Many people think that death is the destiny of life, but in the palace of science, immortality is the original attribute of life, and death is just the product of evolution. Early life on earth was born 3.8 billion years ago, when life was immortal. This is the nature of life.
Then why did the life after evolution lose the attribute of immortality? In fact, this is a kind of helpless performance. In the process of evolution, life finds that although immortality sounds tall, it is difficult to adapt to the changing environment, and immortality is also very unfavorable for the evolution of life to a higher level. Immortality means immortality. What’s going on?
To explore why life on earth gave up immortality, we should start from the day when life on earth was born. About 3.8 billion years ago, the ecological environment of the earth met the conditions for the birth of life, so the early simple life was born in the ocean. It took 1.4 billion years for primitive life to last.
In this long period of life, archaea and eubacteria continue to split and live carefree in shallow water. They also maintain the original nature of life, immortality. Under normal circumstances, these Archaea and eubacteria can survive forever. But at this time, nature is not willing to, you know, for the will of the earth, the evolution of life to higher life is the mainstream.
However, these Archaea and eubacteria have the property of immortality. In the period of 1.4 billion years, there has not been much evolution, and they are still some primitive simple life. The dissatisfaction of nature, coupled with the massive reproduction of these ancient creatures at that time, blue algae produced a lot of oxygen to gather in the atmosphere. For life on earth, not all life like oxygen, and oxygen content is too high, prone to oxygen poisoning.
So, 2.4 billion years ago, the oxygen in the earth’s atmosphere reached a high peak. They were all produced by cyanobacteria, so the “Great Oxidation Event” broke out. First of all, anaerobic organisms are constantly poisoning and dying. At the same time, oxygen will consume the greenhouse gas methane in the atmosphere. As a result, the temperature of the earth has dropped by 70 ℃ in tens of thousands of years, and the whole earth has become a frozen planet.
For Archaea that can live forever, most of their gene mutations are harmful, because they can’t screen harmful genes. With the spread from generation to generation, these immortalized life such as archaea are very fragile, they can not adapt to the sudden changes in the ecological environment, so these Archaea have died. In the end, immortality harms them and becomes immortality.
Of course, in this ecological upheaval, archaea did not all perish. If all of them die, the life continuity of the earth will be broken. It may take a longer time for new life to be born. If so, it is still unknown whether the earth can be born as scheduled.
Some of the Archaea survived, and then they developed a gene recombination mechanism in order to adapt to the environment. It is this mechanism that enables later life to adapt to the complex and changeable new environment. Their offspring have a loud name, eukaryotes. This new way of reproduction is sexual reproduction. Today, all animals, plants and fungi are the offspring of these primitive eukaryotes.
Seeing this, I believe many friends also understand that immortality is a mechanism that the early creatures on earth had to give up. If they don’t give up and make changes, then life can’t continue to evolve. Life is about to face the risk of ending, which is a helpless change. After choosing sexual reproduction, ancient life has finally found many advantages through generations of evolution.
In the sexual reproduction of higher organisms, parents need to undergo gene recombination to produce children, and children can no longer continue their parents’ lives. From the moment when life chooses sexual reproduction, it means giving up the ability of immortality. The reproduction speed of sexual reproduction can not be compared with that of immortality, but sexual reproduction organisms can only transfer half of their genes to their offspring.
This kind of gene transmission seems to be contrary to the original gene continuation idea of life, because in the immortal paleontology, all of its own genes will be passed on to the offspring, which seems to be a good way of continuation, but ancient life has forgotten that there are not only good genes but also harmful genes in the gene sequence of life.
If the mother passes on all her genes to her offspring, her harmful genes will continue. Slowly, there will be a lot of problems in the life body, and it will not be able to evolve to a better and higher life, let alone the birth of intelligent life.
Sexual reproduction is different. The mother can only pass on half of her genes, while the other half of her genes are obtained from her father. When two genes are recombined in a new individual, new genes will be produced. In this process, some bad genes may be removed, so as to make the new life better. This is the most correct evolutionary model of life.
The evolution of life to a higher life is actually the continuous optimization of genes. When genes become more excellent and powerful, life will continue to upgrade and become a higher life. And this kind of evolution pattern can only be realized if the genes are constantly mutated and recombined. If life continues to maintain the property of immortality, then the gene will not be able to achieve effective mutation and recombination, because the mother will completely transfer its own gene to the offspring, so the gene can no longer be recombined.
It can be seen from this that after the birth of life on earth 3.8 billion years ago, after the continuation of 1.4 billion years, we finally understood the significance of life evolution, so we began to give up immortality from 2.4 billion years ago and went to the road of sexual reproduction. Thus, life on earth ushered in a brilliant moment. In the rapid evolution, life body became more and more abundant and advanced, and finally intelligent life human was born millions of years ago.
Although ancient life gave up immortality, with the rapid development of science and technology, the power of science and technology can solve the mystery of gene. At that time, maybe immortality will return, and human beings may realize immortality in the future. However, it is difficult to say whether immortality is good or bad for human civilization.
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