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, even on the verge of extinction. 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 walked out of 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.

The earth was born 4.6 billion years ago, and human beings appeared on the earth for about 3 to 4 million years. Scientists have been studying an interesting topic: how many people have been born since the appearance of the earth?

According to United Nations statistics, as of March 29th, 2020, the total population of 230 countries in the world is 7,585,204179, of which the population of China is about140100000, and by 2040, the world population will reach 8 billion.

With the rapid population explosion on the earth, there have been climate, environment and resource problems of air pollution, and interstellar migration is imperative.

Some scientists are also studying and discussing how many people have appeared in * * since humans appeared on the earth.

178 1 year, the performance of Kraft Institute of Russian Academy of Sciences is172.7 billion people. From 65438 to 0959, Austrian professor Wickell calculated that there were 300 billion to 500 billion people. However, their scientific research results are not recognized.

Later, a scientific research team in the United States deduced by computer that if there were100000 people at the beginning of human beings on the earth, the annual birth rate would be 5%. After three or four million years of reproduction, there are about 79 billion people on the earth, which is generally accepted internationally. .

The soil on the earth is composed of rock fragments weathered for billions of years, which has a great relationship with the decay of human bodies.

After weathering, alluvial deposits are formed under the action of gravity, water flow, wind and glaciers. These alluviums form fertile soil under the influence of microorganisms and plants, climate, topography and time.

The human body is mainly composed of water, minerals, protein, lipids and sugars. After death, the body returned to nature through burial and cremation.

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 all readers are satisfied with the above answers. Please deduct "1" if you are satisfied, and deduct "8" if you are not satisfied. Many parts of the soil are made up of corpses, which not only form soil, but also form some rocks. Silicified wood is the corpse of a tree. A part of petroleum coal has been formed. In ancient times, there were thousands of tons and hundreds of meters of towering trees, which could be seen from the coal seam. Oil was formed by the decomposition of organic matter, plankton and animal and plant carcasses at that time, and biogas organic matter was visible in the black soil swamp. Human bodies are almost out of proportion, similar to tigers and lions. In a suitable biological environment, the reproduction and growth of locusts and flies are increasing day by day. There are also a large number of microorganisms and bacteria that decompose the body. Coral corpses will pile up coral reefs on the sea surface. It is no exaggeration to say that hundreds of millions of years of corpses have made a shell for the earth.

Since the emergence of human beings on the earth, the total birth population should be around 80 billion to 654.38+000 billion. About 90% to 95% of them have died. People who are alive now account for only about 5% of the total human birth population. So many people died on the earth, did our soil evolve from the human body? I'm telling you it's not.

Our planet is a rocky one. At the earliest time, there was no soil on the earth, because the earth existed for too long. After a long period of wind and rain, many rocks have weathered into stones, and stones have turned into sand or desert. After a long period of wind and rain, the desert has its first microorganisms. Under the action of microorganisms, there is a small amount of soil and fungi. At this time, some original plants grew in the desert.

So soil didn't evolve from human body. It evolved over a long period of time under the action of wind, rain and sunshine, and under the action of microorganisms and fungi.

A * * * appeared on the earth about one hundred billion human beings! Everything originates from the earth, and everything returns to it. People eat food grown in the soil, grow into bodies, turn into soil after death, and return to nature! So, soil didn't evolve from corpses!

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 animal and plant residues, 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.

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!