Why did humans evolve into different skin tones and hair?

Human beings have evolved into different skin tones and hairs because of the need to adapt to the environment. From a biological point of view, human skin color and hair color are controlled by genes. These genes are influenced by natural selection and environmental stresses that gradually alter the physical characteristics of humans.

We can see that humans are distributed all over the world in different geographical locations and climatic conditions. In areas with high temperatures and sunshine, people tend to have darker colors to protect themselves from UV rays. In this case, melanocytes produce large amounts of melanin to darken the **.

Conversely, in cold climates, people tend to have light or white ** to better absorb the vitamin D contained in sunlight. At this time, melanocytes produce melanin in small amounts.

Hair color is also affected by similar natural selection factors. For people living in extremely cold regions, having light or white fur can help them better hide in the snow and avoid being spotted by prey; And for people living in desert areas, having dark hair can effectively block the sun and protect them from UV rays.

Human skin color and hair color are also affected by humans' own genetic variations and migrations. As humans continue to migrate and communicate, genes are constantly mixing between different populations. This genetic mixing creates more variation and diversity, resulting in the appearance of different skin tones and hair colors.

Humans have evolved into different skin tones and hair, which is a result of a combination of natural selection, environmental stressors, genetic variation, and migration. The physical characteristics of each person are a product of adaptation to the environment. By understanding this, we can better respect and appreciate the beauty of different skin tones and hair colors, and better understand the deep and interesting stories behind them.

Asian black hair yellow**.

Africans with black hair and black hair.

Europeans with blonde hair and white hair**.

Why do humans have different colors?

Through long-term research, scientists have found the root cause of different colors: there is a pigment cell in the human body, and the difference in skin color between different races and people of the same species is only due to the different content of melanin (a brown pigment) in **. Regardless of ethnicity, the more melanin produced by pigment cells, the darker the skin tone.

There is a large amount of ultraviolet rays in sunlight, and melanin can absorb ultraviolet rays and use it to make essential vitamin D, but too much ultraviolet light is harmful. In Africa and other sunny places, dark skin has a protective effect on the body, because melanin absorbs a large amount of ultraviolet rays, and there is not too much ultraviolet light entering the cells; In Scandinavia and other places with less sunlight, a white complexion allows a person to absorb enough UV rays to make vitamin D. Therefore, the difference in skin color is gradually formed by human beings in the process of long-term evolution to adapt to the environment.

The color of human beings is determined by four colors: white, yellow, black and red, which are matched according to different proportions. The whitest people are in Northern Europe, the blackest people are in West Africa, and the yellowed people are in Southeast Asia. Sunlight can promote the production of melanin in **, so people who live in the tropics have more melanin and ** are darker.

According to biological explanations, people produce variability in different environments, and long-term variation leads to differences in human race.

For example, in Africa, where people have survived in the natural high temperature and high ultraviolet environment for millions of years, in order to adapt to survival, natural selection has left the darker human race, so it has become what we call the black race.

The black of the black person can reflect more ultraviolet rays and can not cause more damage. Hair curls to increase scalp coverage. The soles of the feet are enlarged, which is suitable for long-distance running and walking, and the stress surface is larger.

Because the living environment is different, wow.

In order to adapt to their own living environment.

This may have a lot to do with the environment in which we live, as humans once lived in the rainforest and needed hair to withstand the temperature difference between day and night, and now the unimportant hair with clothing and shelter is slowly disappearing. Hair is preserved because of its aesthetic and protective effect on the delicate scalp, and body hair from other parts of the body can also help perspire and protect the body.

Hair was originally a protective surface**, but with continuous evolution, people now have clothes to cover, so in this case, the hair is slowly fading, and it is also because of the change of the surrounding environment.

Because humans have learned to wrap their bodies with some animal fur, and they will often wash their bodies, those hairs are very inconvenient.

It is understood that the evolution of human beings will not be manifested in changes in the external body shape, and there will be no qualitative changes in its appearance. The evolution of human beingsNatural environment, thus promoting the development of thinking from low IQ to high IQ. The environment makes human beings, and skin color is closely related to the environment and climate, black and brown people.

Most of them are born in the tropics, most of the yellow people are born in the temperate zone, and most of the white people are born in the cold zone. Since the skin color gene is fixed by the local climate, the skin color will not change much even if it flows to different environmental zones.

We know from the geography class in junior high school that there are three major races on the earth: yellow, white, and black。In addition, there is also a brown race, which is mainly found in Australia and the South Sea Islands.

and other places, which belong to the local indigenous people, and the current population is small due to the squeeze of white people in history.

It's actually easy to understand why there is a difference in skin color。My own cats, although they are the same breed, don't they also have a variety of coat colors. The cubs born to the same female cat, some of them have yellow hair, and some of them have white hair, which is caused by genetic differences.

This is also the case between different races, and the reason for the different skin colors is due to the differentiation in the history of human evolution。The sun's ultraviolet rays.

It has a great impact on the skin color of human beings, and a white person who works in the sun for a long time will also tan, and the differentiation of human skin color is affected by this. As we all know, in ancient times, monkeys had a very small population movement around the world, so the differentiation was more serious, and it is believed that in the future, the difference between human skin colors will become smaller and smaller.

Even if it is a person of the same skin color, there will be differences between individuals, some people are born with curly hair, and some people are born with itDouble eyelidsThis is the genetic difference。The relative difference in the same unit trait between organisms of the same species is called a relative trait. Therefore, you should never discriminate against others because of the color of your skin.

It is because in the process of human evolution, in order to adapt to the environment, the skin color and physique of the body have changed, so the appearance is different from that of apes.

Although it is purified, animals are still animals, and humans are still humans, so there are still some differences, and the physique is also very different. The skin color still seems to be a certain difference from that of humans.

Because DNA has changed in the process of evolution, and the environment in which they live is also different, people's skin color and physique are very different.

Because the structure of the body is different, so the constitution of people is also different, plus there are different environmental factors around the world. That's why the skin tone will be different.

In the process of continuous evolution, human beings gradually lost the thick hair on their bodies, because from the perspective of evolution, human beings can be traced back to humans, and chimpanzees are the same raceBut after the purification of the day after tomorrow, we walked down from the tree, and then we had productive labor, and the hair on our body gradually disappeared. <>

The disappearance of human body hair is related to the invention of such things as clothes, because at the earliest time, human beings walked down from the trees to carry out collective hunting activities, although it is said that the era of hair leads to blood, but at that time people already had the concept of wearing clothes, and there was a difference between men and women, at least at that time people knew how to remember a straw skirt, this habit, and later won the change of people's ideological conceptsMore and more people think that it is important to wear clothes, and more and more clothes are worn, and slowly people's bodies feel that with the protection of clothes, they do not need the protection of hair, and it gradually disappears. <>

Our body is a very intelligent system, and its evolutionary direction is determined by our current needs, just like the earliest humans were similar to chimpanzees, walking on all fours, but then people stood up, and then people learned to use tools with their hands, learned to use open flames to roast food, and now people have developed more and more towards the evolutionary aspect of the brain, because people are more closed to find that the human body has evolved to the extreme, and can only evolve accordingly from the brain，One of the obvious trends is that today's little ones are getting smarter and their brains are developing much earlier than we did a few decades ago. <>

This is a major trend in human evolution, our body will continue to change its evolutionary direction according to our needs, so we can't speculate on the outcome of brain evolution, but we know that the average IQ of children is constantly rising, and they are much more efficient at learning some external affairs than those of us a few decades agoThis is indeed a very good contribution to the development of human beings as a whole in terms of scientific research, but it is impossible to speculate on what the human brain will look like when it evolves to the ultimate state.

Because in the long-term evolution, people gradually learned to make clothes from animal skins or cotton and hemp to keep them warm, and the thick hair lost its warmth and gradually degenerated.

Because human beings need to hunt continuously after evolution, and the thick hair is not conducive to stuffy and sweating, so the hair gradually faded, and later clothes appeared to be made of ants, so there is no need for Mao Yanyan hair to keep warm.

Because through this acacia-like way, you can protect your own health, make the development of human beings faster, and you can not damage your body, so you will choose such a coarse jujube method.

Why don't humans have thick hair? Could it be that the process of evolution has faded?

Introduction: As we all know, the evolution process of human beings and other animals is a very slow and very wonderful process, first of all, all kinds of animals we see in nature are formed by hundreds of millions of years of evolution and evolution, and even human beings themselves have gone through a long evolutionary process to evolve to what they are today, in fact, some careful people will find that most animals have body hair or thick hair, and most parts of the human body hair have faded, What are the reasons for this? Next, I will analyze it for you.

1. Human migration.

Human civilization is a very wonderful thing is that I have traces of human existence in all corners of the world, many areas of the climate is very cold, but there are still many human beings living there, and some areas are very hot, and most of the people live in this kind of place, this is due to the fact that human beings often migrate in the process of changing their pants, and those who live in hot areas will lose some of their body hair over time.

2. Human development.

With the evolution and development of human beings, human beings can gradually master a variety of tools, and even be able to manufacture a variety of complex products, such as cold clothing, when people feel cold, they will make a lot of cold and warm clothing, and even in hot areas, people will also make some clothing that covers important parts, so human beings will also lose a lot of useless body hair.

3. The wonder of nature.

Nature is a very wonderful system, flowers and plants in nature and all kinds of small animals are wonderful masterpieces of nature, human beings are also the products of nature, so people must be in awe of nature and respect nature at all times, only in this way can we better protect their habitat, people have not found that there are actually many things, at all times we must maintain the enthusiasm to explore, little by little to dig out the wonders of nature.

Because in the process of evolution, people began to wear clothes and eat cooked food, and no longer needed heavy hair to keep warm.

Good morning Mr. Question! Please tea! It is reasonable for human beings to lose gray hair in the process of evolution, why do we say this, first of all, human beings in the process of evolution, from crawling on all fours to walking upright, intelligence is also evolving, the function of the hand has evolved quite dexterously in the process of evolution, excessive hair on the body will lead to the reproduction of parasites, and illness will occur, and, in order to resist the cold, early human beings wrapped themselves with leaves and animal skins to resist the cold, and in the long run, the hair on the body will be rubbed and fallen off, with the speed of evolution, The hair on the body will evolve to the most suitable law for human survival, which is the beginning of human civilization.

I'm sorry! My cultural skills are limited, I hope Mr. can understand it, thank you for the invitation! Peace and health!