How many people died on the earth? Did the soil evolve from corpses?

At present, nearly 7.8 billion people live on this blue planet. Every day, new babies are born and people leave this world every day. But on the whole, the world population is still growing.

So, how many people have been on the earth? Are there more people dead or alive at present?

Humans have traveled all over the earth's continents, even flying into space and going to the moon, a planet beyond the earth. But in the distant past, human beings were just a weak species, and even endangered. In order to understand how many people have lived on the earth, let's first briefly understand the evolution of human beings.

Humans belong to primates, and the evolutionary history of this purpose can be traced back to 65 million years ago. At that time, the violent impact of an asteroid led to the extinction of a large number of species such as dinosaurs. A large number of niche vacancies gave the surviving primates a chance to fill them, and they began to multiply on the earth.

By 3.9 million years ago, Australopithecus, a transitional species between apes and humans, appeared in Africa. By 2.5 million years ago, Homo habilis had evolved and was the first species that could be called human.

About 200,000 years ago, Homo sapiens appeared. Homo sapiens left Africa about 50 thousand years ago and spread all over the world, replacing the local prehistoric humans. In other words, people all over the world today are descendants of Homo sapiens who left Africa that year.

However, it is difficult to know how many people have always appeared on the earth. Because human beings have only a few thousand years of written civilization, human evolutionary history is in a primitive state most of the time, and it is impossible to have demographic statistics. But what is certain is that the number of primitive humans is very small, and it may be so small that it is on the verge of extinction.

Gene sequencing shows that at present, humans on the earth generally have very similar genes and the genetic diversity is very low, which means that more than 7 billion people in the world come from a very small population. It is estimated that the population of the earth may once be as small as 40 and almost extinct. If humans are allowed to evolve again, we may have become extinct.

Demographer Carl Haub once roughly estimated that there were only two Homo sapiens who left Africa 50,000 years ago, a man and a woman. By 654.38 million years ago, the population had reached 5 million. After 1 100 million years of growth, by the first year of AD, the world population had reached 300 million. For a long time to come, the population growth rate increased slightly, but it was still very slow.

After the industrial revolution, the population began to grow rapidly. 1850, the world population is 125 billion. 100 years later, by 1950, the world population has doubled, reaching 2.5 billion. 2 1 century, the world population exceeded 6 billion. Today, the world population is still growing rapidly, with about 360,000 people born every day and about 6,543.8+0.5 million people dying every day, with a total population of 7.76 billion.

Generally speaking, there are about10 billion people on the earth, far exceeding the current world population.

Not only many people live on the earth, but also many other species. The number of existing species is only 1% of all species in the past. In this case, where did the body go? Did the soil evolve from corpses?

After biological death, the corpse will be gradually decomposed by microorganisms, and the atoms on it will not disappear, but will be transformed into other forms, some of which will become part of the soil and the other part will be absorbed by new life. However, the main source of soil formation is not remains, but bedrock weathering.

CarlHaub, an American demographer, believes that before the emergence of agriculture, the world population was only about 5 million to 6.5438+million by hunting for a living. By the 1 century, according to the intermittent census in Rome, China and the Mediterranean at that time, the world population had increased to 300 million.

1900, the world population was only1600 million, but the rapid population growth in developing countries led to a sharp increase in the world population, so the existing population accounted for an increasing proportion of the pre-Earth population.

By 20 1 1 year, the world population has reached 7 billion, accounting for about 6% of all the inhabitants on the earth.

It is estimated that the population who once lived in the world reached116.7 billion.

Generally speaking, a corpse buried in the soil begins to rot after 8-9 days, and it will rot into bones in more than 2 months (69 days in the air; 56 days in water; In soil 102 days), it takes 10 to 15 years for bones to become brittle. Of course, it is also said that summer 10 days to 1 month, spring and autumn 5-6 weeks. Winter lasts for more than a few months. There are also bodies buried in the soil that take about 3-4 years to become bones, and some take 7- 10 years. The skeleton of the corpse was buried about 1 year in southern China, 1~ 1.5 years in Shanghai and 4 5 years in northern China. Any factor conducive to the growth and reproduction of putrefying bacteria can accelerate the process of corpse decay. On the contrary, the progress of corpse corruption is slow or even stopped.

So will the body form soil after corruption?

Let's look at the composition of the soil. There are four main types:

1, inorganic substances-such as small-grained rocks and clay;

2. Organic matter-such as rotting corpses of animals and plants, also known as humus;

3. air;

4. water.

It can be seen that animal and plant carcasses only account for a small proportion, and more are animal and plant excreta. Moreover, compared with animal and plant corpses, the proportion of human corpses is lower.

There are nearly10 billion people on the earth, and the death toll is almost so much. Most of them are natural deaths, but there are also unnatural deaths.

The soil contains elements of corpses and other elements. The bodies here belong to all animals and plants, not only people, but also formed over thousands of years. So to some extent, it can be considered that a small part evolved from corpses.

Soil is composed of various granular minerals, organic matter, moisture, air and microorganisms, and plants can grow. Soil consists of minerals, animals and plants, organic matter, soil organisms (solid matter), water (liquid matter), air (gas matter), oxidized humus, etc.

How many people died on the earth? Did the soil evolve from corpses? You asked two questions at the same time. First of all, the first question:

How many people died in * * * on the earth? Since Homo sapiens first appeared about 52,000 years ago, about 654.38+008 billion people have lived on the earth.

However, there are many other estimates, ranging from as low as 45 billion to as high as 654.38+04 billion. Most scientists seem to agree that the death toll is above 654.38 billion.

Today, the current world population is about 7.4 billion, which means that at least 93% of human beings are living and dying.

The second question:

Did the soil evolve from corpses? Answer: No.

Soil consists of organic matter, gravel and minerals.

All soil originally comes from rocks, which are called "parent materials". The parent material may be directly under the soil, or it may be far away if the wind, water or glaciers carry the soil.

In addition to soil-forming parent material, the formation of soil also depends on other major processes that affect soil formation. The process of soil formation is called "diagenesis". Climatic conditions are important factors affecting the form and rate of physical and chemical weathering of parent materials.

It is estimated that it will take 500 to 1000 years to form an inch of soil.

I don't know whether the subject and readers are satisfied with the above answers. Please deduct "1" if you are satisfied, and deduct "8" if you are not satisfied. Answer the first question first. How many people have died or died on earth? It is not easy to say this value accurately. Although there are global population statistics in recent years, including birth rate and death rate, this time limit is limited to recent decades, and the statistical caliber cannot be completely covered, so its accuracy and timeliness cannot be guaranteed. In addition, human beings have a history of about 5 million years since their birth, and the life span of human beings is constantly improving with the improvement of production methods and social civilization, which increases the difficulty of estimating how many people once existed on the earth. So we can only get an approximate value through estimation.

There are really scientists in the world who have done this research. For example, Howard, an American demographer, finally calculated the total population of * * * on the earth as 65.438+006 billion by setting the starting year of modern human birth, the average growth rate of population in different historical periods and the average life expectancy of human beings in different periods.

Answer the second question, did soil evolve from corpses? It is estimated that the subject refers to the bodies of all animals, not just the human body. So, before answering this question, let's look at the composition of soil. According to the conclusion of scientific research, the soil on the earth is composed of solid phase, liquid phase and gas phase, in which the liquid phase refers to the water in the soil and the gas phase refers to the air in the soil pores, which will not be discussed here. Our traditional cognitive level refers to solid soil.

Solid soil mainly includes two parts: minerals and organic matter. Among them, minerals include primary minerals (parts that have only undergone physical weathering without chemical changes, such as silicate, aluminosilicate, sulfide, phosphide and other ore fragments) and secondary minerals (new minerals that have undergone physical weathering and then recombined through chemical changes, such as carbonate, secondary pig iron minerals and secondary aluminum minerals). ), which are the original and basic components of soil. Organic matter refers to carbonaceous organic matter in soil, and its sources include decomposition residues of animals and plants, microbial residues and so on. And humus accumulated from it. It is an important source of nutrients and energy needed by most plants and microorganisms to maintain life activities, and its proportion in the total soil is low, generally between five thousandths and one tenth.

As can be seen from the above, the decomposition of animal carcasses is a part of soil, and it is an important channel to protect soil nutrients, just like plant residues. But it can't form soil directly, and it can only be used as a sign to measure soil nutrient content. Soil with high organic matter content is rich in nutrients and strong in fertility, whereas it is relatively poor. There are so many black lands in Northeast China, which are very fertile and suitable for crop production. It is called the "granary" of China. The reason why the soil is black is because of the high humus content, which is formed by the decomposition and long-term gestation of a large number of plants including animals in history. But from the root of soil formation, rock weathering is still the most basic source, and the bodies of animals and plants are only the main source of auxiliary organic matter.

Human beings are the only creatures on the earth that have developed intelligent civilization, and have existed on the earth for millions of years. Of course, we need to look at the stage of starting timing. Modern humans are descendants of Homo sapiens, which can be traced back to 200,000 years ago. And if it starts from Australopithecus, it can be traced back to two or three million years ago; It is about 6 million years since the ancestors of chimpanzees were classified; About 654.38+05 million years ago, the forest apes began. This is a complete history of human evolution. After the extinction of dinosaurs 65 million years ago, it gave up enough living space and living resources to supplement the development and evolution of mammals.

The journey of mankind has not been smooth sailing. There are many natural and man-made disasters, and the rapid change of population actually began in the last hundred years. At present, the global population is about 7.7 billion, while 1804 is about 10 billion, and 1927 is 2 billion. After that, it took only 33 years to break through the 3 billion mark at 1960. The population rose to 4 billion in 1974, exceeded 5 billion in 1987 and reached 6 billion in 1999. By 20 1 1, the global population has reached 7 billion.

With the improvement of living standards, medical technology and quality of life, the population continues to explode. In earlier times, the birth rate was low and the death rate was high, so the total population was small. War, plague and famine are the three major problems faced by early human beings, which also cost many lives. Scientists speculate that the total population of the world increased by 1 million 70,000 years ago, and it did not increase to10.5 million until1million years ago.

There is a data that cannot be judged to be true. It is said that if people on the earth have never died, there are about 654.38+00 billion people on the earth so far, but in fact there are about 7.7 billion people on the earth now, so we can know how many people on the earth have become dirt.

Some people may think that after death, the body will turn to dust, but this is not the case. First of all, we should know that the body water content can reach 70%~80% in infancy and 60% in adulthood. This water includes our body fluids, tissue fluids, cell fluids and so on. In short, in the end, the water will not become soil. Most of the remaining organic tissues will become their energy, which will be dissipated after being digested by bacteria. Some gases will enter the atmosphere, and only a very small part of inorganic substances will become soil, such as bones on the body.

The fossil energy we are using now is considered to be the compression of ancient animal and plant carcasses. After a long period of evolution, it finally became oil, coal, natural gas and so on. Of course, some people deny this view and think that oil is abiotic. Of course, the mainstream view still believes in the saying of "bio-oil".

If all living things die in essence, they will eventually be completely decomposed into hydrocarbons, oxygen, nitrogen and other elements and return to the universe. Waiting to get together again and form a part of a new life.

It's really ignorant and fearless. How did the idea that the earth's soil comes from dead bodies come into being?

Tell you, the earth's soil is weathered by rocks, the weathered sand powder is transported and accumulated by rivers, rain and floods, and the rain-deficient areas are accumulated by wind.

Of course, the soil contains animal and plant remains and humus. Except that the humus content in the bottom soil of swamps and lakes is as high as about 30%, the humus content in other environmental soils generally does not exceed 10%. Humus soil is mainly composed of decaying stems, leaves and roots of plants. The rest is composed of fine particles and powders of various minerals, accounting for more than 80%. Soil accumulated by wind in an environment where no animals and plants grow is called "aeolian sandy soil"; Volcanic eruption is called volcanic ash accumulation soil; The soil melted by volcanic ash accumulation is called "volcanic ash accumulation lava". If the earth's soil is composed of human corpses, what a horrible and tragic world is the earth?

Don't talk nonsense when asking questions, ask some common sense information. So as not to make people laugh and cry!

How many people died on the earth? How many people were there on the earth? It's hard to count this figure, but one thing is certain: there must have been more people on the earth than there are now.

By 20 18, the total population of the world has reached 7.6 billion. New people are born every day on the earth, and people leave this world every day. But on the whole, the current world population is still growing.

However, life is only a hundred years, and people who live on the earth will eventually leave this world. So the more people there are now, the more people will die in the future. Scientists have verified that about 3.2 million years ago, Australopithecus appeared in Africa, which was a transitional species from apes to humans. About 2.5 million years ago, the emergence of homo habilis marked the emergence of mankind. 2.5 million years of human history is quite long compared with the short life of human beings.

Let's make a hypothesis. Let's assume that the life span of primitive humans is the same as that of modern people. According to the modern average of four generations per kloc-0/00, human beings have multiplied 65438+ 1 100 million generations in the long 2.5 million years. These 654.38+ten thousand generations are not in this world except those who were alive in the last hundred years.

So there are far more dead people on earth than alive people now. But there is a problem. When early humans first appeared, there was no such a large population and their life expectancy was shorter than that of modern people. It is estimated that there may be 654.38 billion people on the earth.

Illustration: World population growth

There is a saying that "dust returns to dust, and when it is in full bloom, it is just a handful of fine sand." People live on the earth, and the path of life comes from the earth. Finally, people died and returned to nature. There used to be so many on earth. Before the appearance of human beings, the history of other creatures on earth was even longer. There used to be more other life on the earth. So did the earth's soil evolve from the dead bodies of living things?

Illustration: Soil

Soil, that is, soil, was originally formed by weathering rocks on the earth. Weathering breaks rocks and forms loose soil parent material. These soils contain minerals needed for plant growth, but lack organic matter. The source of organic matter in soil is biology. Organic matter is very important to soil. When we say fertile land, we mean that the soil is rich in organic matter. Plants play an important role in the formation of soil organic matter. Organic matter produced by plants through photosynthesis provides rich organic matter for soil. Of course, animal excreta, secretions and corpses also bring a lot of organic matter to the soil.

Illustration: Rotten leaves eventually become part of the soil.

Therefore, the biological corpse eventually became a part of the soil. Just as the poem says, "Falling red is not a heartless thing, but turning into spring mud protects flowers more".

There are more than 7 billion people living on the earth, but there are still newborn babies coming into this world. Obviously, the current population index will not decrease but increase year by year.

Then the problem comes, the number of people who die every year is as high as more than 50 million, not to mention the number of people who died before our development. So many people died for some reason, so where are these people? Did the soil evolve from corpses?

If we want to know how many people have died on the earth or how many people have died, then we must first understand how we humans appeared. As we all know, we humans are all evolved from primitive apes. It can be said that apes are our ancestors. So how many humans have lived on the earth so far? In primitive times, almost the same human beings as "apes" had no way or ability to count the number of human beings.

But Carl Herb, an American demographer, has made such statistics. According to his calculation, from about 50,000 years ago to 654.38+0,000 years ago, almost all human beings were in the Stone Age, and the population should remain in a relatively stable state, with a total of about 5 million people. After 654.38+0,000 years, human tribes appeared in several important river basins in the world, such as the Nile in Egypt and the Tigris River in the Middle East. Obviously, such a place is very beneficial to the development of mankind, and at that time, it will be fine.

However, there is also a negative side. With more races and populations, there will be more wars. Coupled with the plague, the population will fluctuate. For example, around14th century, 75 million people in Europe died of the Black Death, while during the China Three Kingdoms period, the population of China remained below 7 million due to years of war.

After modern times, due to the improvement of social productivity and the development of medical level, the world population reached1300 million in the middle of the 9th century and 2.5 billion in 1950. When the earth entered 2 1 century, the world population exceeded 6 billion. At present, the world population is still growing rapidly. Let's see, about 30 million people are born every day. About 6.5438+0.5 million people died, with a total population of more than 7.7 billion. Add these people together, and there are about 654.38 billion people living on the whole earth.

At this time, some people may ask, where are those dead people? Have their bodies really turned into dirt? Soil, that is, the soil weathered by rocks on the ball. These soils contain minerals to provide nutrients for plants, but without organic matter, plants play a vital role. Plants provide organic matter for soil through photosynthesis. Of course, animal waste and dead bodies also bring organic matter to the soil, so it can be said that dead bodies become soil.

People are organic compounds and will be corroded and decomposed by bacteria after death. The mixture of inorganic substances that cannot be decomposed and inorganic substances in nature is soil.