Why do only humans need to wear clothes to keep warm?

In the prehistoric era of 3,5 million years ago, the anthropoid apes who walked upright gradually shed their thick hair and exposed their increasingly smooth skin directly to the air, so the era of "naked apes" began in the evolutionary history of human beings, and nudity became the most obvious feature that distinguished human beings from other animals. So what are the advantages of naked apes? Why did apes leave the hair-covered age behind and enter the naked age in a short evolutionary time? You know, dinosaurs ruled the earth for 15 million years, and ultimately failed to evolve wisdom and civilization. So from the perspective of biological evolution, what role does this unique phenomenon of "depilation" play in the history of human evolution?

actually, we haven't found a very exact answer to this question so far. It should be said that it is the result of the comprehensive action of different factors. Throughout the process of human evolution, there should be several aspects worthy of consideration and verification by scientists.

First, hairless skin is more conducive to the body's heat dissipation, and the body's heat dissipation ability represents the running ability of apes. Don't underestimate the running ability of apes. You should know that in the nature at that time, human running ability was one of the best. In the process of apes' continuous pursuit of prey, most of the prey were not killed, but were chased to death. Therefore, long-lasting running ability is the only magic weapon for apes to survive. The heat dissipation of the hair-stripped apes has changed qualitatively, and their running ability has been greatly improved. The apes have undoubtedly become the animals that can run for a long distance in nature. Coupled with team fighting, the food they get is greatly enriched, so the number of apes has begun to increase.

Even today, the ultimate running ability of human beings can't be ignored. After running for 42 kilometers in a marathon for about two hours, this endurance can still stand out from other species except horses that are good at running. It is well understood that heat dissipation restricts the running ability of animals. Let's take cheetah as an example. Cheetah is the fastest animal in the world, with a limit speed of 12 kilometers, but cheetah can only run at this speed for a few minutes. At this time, the cheetah's body temperature will rise to 42 degrees rapidly, and excessive body temperature will harm the cheetah's organs, so cheetah has to stop and wait until its body temperature drops before hunting. Apes are warm-blooded animals, too. A lot of heat generated by the intense movement of heart and body muscles needs to be dissipated as soon as possible. At this time, in addition to sweating a lot, the most direct way is the direct heat exchange between bare skin and air, which explains why people from primitive tribes in Africa are top long-distance runners, so taking off their hair is the first thing to make apes more capable of long-distance running.

second, being covered with hair is not conducive to water activities. It is said that most apes choose to live near the water, and they naturally like to settle by lakes and rivers, which is the most important material condition for apes to choose settlements. On the one hand, it is convenient for drinking water. On the other hand, water resources are also the best hunting places for apes, and hunting aquatic animals in the water can get more protein supplements.

Obviously, a whole body of hair is not conducive to swimming in the water, with great resistance and slow swimming speed. Moreover, after landing, the hair carries a lot of water, and the evaporation of water takes away a lot of body heat, which is very unfavorable for maintaining a constant body temperature. Therefore, the less hair, the higher the ability to hunt in the water, and the biological evolution will naturally develop in the direction of less hair, and the group that takes off its hair first will get a better space for reproduction.

Third, it improves the health level of apes. Animals with thick hair will be plagued by parasites and various germs all their lives. So how can we avoid the infestation of parasites? Obviously, hair removal is a simple and effective way. Human beings keep the hair on their heads. Until today, it is as important for human beings to wash their hair as it is to take a bath. Even if there is no condition to take a bath, they should wash their hair at intervals. This shows how important hair cleaning is, because parasites are willing to live in dark and humid corners. As you can imagine, if today's human beings are still covered in hair, how complicated and annoying it is to clean hair.

As you can see, when the monkeys in the zoo are free, the metropolises get together to clean up each other's parasites, such as lice and fleas. When cattle graze in the field, they will keep sweeping mosquitoes with their tails, and more animals will choose to roll in the mud to remove the hateful parasites, which shows that the parasite problem is a problem that all species are not allowed to face. The ape finally took off his hair. "If the hair doesn't exist, the worm will be attached." Finally, we got rid of the parasites in hair, and the health level of human beings has been greatly developed, and the average life expectancy has been greatly prolonged. You know, the average life expectancy of apes at that time was only 3 years old, and there was a lot of room for life growth, so taking off hair was an inevitable choice on the road of human evolution.

Fourth, taking off hair makes people's hands more dexterous, while clear faces can make apes have rich and varied expressions, make daily communication smoother, and further improve the socialization of human beings. With more dexterous hands, apes made a breakthrough in the use of tools. They made spears from natural materials, stone knives for cutting, and sewing needles from animal bones. Before the appearance of language, apes not only made simple calls, but also communicated through gestures. With the naked face, they developed rich and delicate expressions and eyes. Perhaps in which era, whoever has less hair will be stronger, whose face is clearer, who will be more handsome, who will have more leadership and sexual charm, and who will get more opportunities to carry on the family line. Perhaps this is the case. For millions of years, generations of apes have finally transformed themselves and become the overlord of nature. After all, the evolution of human civilization did not follow the evolution process of most species, but went out of its own way.

So, how do apes keep their body temperature without hair?

here, it is worth mentioning that apes have mastered the use of fire, and human beings have accelerated the pace of evolution and started to have a high degree of socialization and social life. On a cold night, everyone sits around the fire, eats the cooked food and feels the warmth brought by the fire. The dark and dangerous nature no longer makes people feel afraid and helpless. After eating enough and wearing warm clothes, they begin to have the opportunity to think about such questions as "Who am I" and "Where should we go". And a large number of hunted animal furs have become clothes on apes. During the archaeological process, archaeologists found a large number of needles made of animal bones and fish bones, which showed that the hair with heat preservation function was lost. In order to resist the cold, naked apes began to use their own hands to borrow animal fur and put on fur for themselves when needed. Until today, human beings still like to wear "fur", which is also a continuation, but today's fur is not from wild hunting, but from pasture.

So until today, primitive tribes in Africa still maintain the habits of ancient people. At night, they light bonfires and dance hula. People pay tribute to their revered ancestors and beg the gods to protect them. It can be said that the evolution of human beings and the domination of the biological world on the earth have gone through vicissitudes and hardships, and finally they have embarked on the broad road. Then where should the next evolution of human beings go? Perhaps only God knows the answer. But one thing, with the growing power of human beings, how to protect ourselves from being destroyed by our own too powerful power is what we should think about today.

There are two most popular theories about why only human beings need to wear clothes to keep warm. One is that human beings need to wear clothes to keep warm when it is cold, because their hair is gradually lost in the process of evolution in order to adapt to the large amount of heat emitted during the strenuous exercise of walking upright. Another theory is that Homo sapiens evolved near the hot equator in Africa. When migrating to other parts of the world, in order to adapt to the colder climate in other regions, it is necessary to wear clothes to keep warm.

To know why people wear clothes, the first question to be solved is when did people start wearing clothes? However, it is difficult to determine the exact time when humans began to wear clothes. Early clothes were all things like skins, which would degrade rapidly. Therefore, there is almost no archaeological evidence to determine the date when human clothes began to be worn.

According to the research of gene evolution of skin color, human beings lost their body hair about 1 million years ago, which is the ideal time to start wearing clothes to keep warm. However, the earliest tools found to scrape hides can be traced back to 78, years ago, and hides have other uses, such as providing shelter, rather than making clothes. Eye needles for clothes began to appear about 4 thousand years ago, but these tools are used in more complicated clothes, which means that clothes have existed for some time.

A study by the University of Florida in 213 concluded that human beings began to wear clothes about 17, years ago by studying the evolutionary branching time of lice and other lice, which is consistent with the end of the penultimate ice age, indicating that clothes appeared 7, years before human beings began to migrate from Africa to the north, and the invention of clothes may be a factor that made immigration possible.

You will get pregnant if you squeeze the bus without clothes.