If there is only one man and one woman left, can mankind return to its present level?

Let's start with the conclusion that if there is only one man and one woman in the population, it is impossible for the population to return to a danger-free state. Let's talk about the reasons in detail.

A man and a woman

First of all, if the earth suddenly encounters a catastrophe and only one man and one woman are lucky enough to escape the extinction crisis, then according to the probability, they can't be in the same place at the same time.

If two people are far away, have no communication equipment, and search aimlessly, they may never find each other.

Even if there is communication equipment, they may miss it because they don't know the contact information of each other because of the language barrier.

Even if two people can get in touch and know their exact location, it is difficult for them to meet.

First of all, because there are only two people left on earth, many equipment services have stopped. For example, there are no planes, no high-speed trains, no trains, and no people who repair cars. When the car breaks down halfway, all we can do is get off and look for the next car.

Moreover, because there are only two people left, the growth and reproduction of animals will no longer be restricted by human beings, which will make animals occupy the territory where human beings once lived. For example, wild animals appeared in many cities during the epidemic. When the number of animals increases, the survival of human beings will be threatened by animals, and it is very likely that they will die.

Even though these two people are lucky enough to break through these obstacles and find each other, there are no doctors, nurses, modern medical care, farmers, milkmen and so on. In the process of survival, people will still face various problems, such as dystocia and bacterial infection. It may cause women to encounter accidents during childbirth.

Moreover, their offspring can't find other humans in the world, so they can only inbreeding. Inbreeding will lead to the activation of recessive genetic diseases, which will make the genetic quality of their offspring not high, which is likely to lead to a decline in survival rate.

Even if we can live to the end, there will be no farmers to grow food, no workers to produce clothes, no fertilizers and pesticides, no help to produce knives, and no pigs? In other words, because there is no division of labor and cooperation between people, all the work must be done by two people, so the efficiency of human energy production is definitely not high, so it is difficult to survive in nature.

Scientists have published some information about? Interstellar migration? According to their research, we can draw the conclusion that if a species has only the last two individuals, their ultimate fate is extinction without the help of modern technology. Why is this?

How many people does the world need at least to continue its blood?

Scientists have been thinking for a long time about how many people are needed to continue human descent without extinction if interstellar migration is carried out.

Scientists assume that if the average fertility rate of each girl is 2? 0.5, and the average life expectancy of each girl is over 85 years old, and that of men is over 79 years old.

Moreover, human beings have sufficient energy, and their survival skills are different, so at least 98 talents are needed to ensure the continuation and continuous reproduction of human blood.

But the reality is that if there are only 98 people in the world, the ability to resist risks will be very poor. If the external environment changes suddenly, then human beings will be extinct with great probability.

First of all, we know that human beings are troubled by microorganisms all the time, especially some epidemic diseases. If the population is only 98, even if someone is a doctor, a temporary non-fatal cold may kill people because of lack of medical care and medicine.

If another highly contagious virus breaks out among humans, the speed of human extinction will be greatly accelerated.

In addition, when the population decreases to a certain extent, the number of animals will increase. Although humans can use tools, once they are alone, they are easily attacked by wild animals.

In the final analysis, when the number of organisms is reduced to a critical point, the greater the pressure of survival, the ability to resist risks will be greatly reduced. A slight flood, a disease and an earthquake can all lead to extinction.

What are the advantages of a large population?

On the earth now, the population has exceeded 7 billion. According to scientists' prediction, the population is expected to exceed 654.38+00 billion by the end of this century.

A large population means that human beings can produce more energy. For example, before the industrial revolution, human beings relied on traditional farming, and the grain output was not high. But after the industrial revolution, human beings invented chemical fertilizers and pesticides, which increased the grain output per unit area and could feed more people.

Moreover, the advantage of the industrial revolution is that it liberates the labor force and allows the population to engage in industry, manufacturing and scientists instead of agriculture. These division of labor and cooperation have further improved people's production efficiency.

Due to the increase of population, people can unite to transform the earth's environment, such as building water conservancy projects and dams. Compared with the smaller population, the increase in population has obviously improved the ability of human beings to resist risks.

However, the increase in population also has side effects, that is, environmental pollution and occupation of wildlife space.

If there is only one man and one woman left on the earth, human beings will be doomed to extinction at this time, and the current population level will not be restored anyway. It takes at least 98 people to maintain human blood. The larger the population, the stronger the ability to resist risks.