Why are southerners shorter than northerners?

Reasons for the difference in height between the north and south viewpoints 1: It is mainly caused by climate and diet. There are as many people with high noses, deep eyes and hairy hair in the south as in the north. The difference in climate makes the plants and animals in the north grow very tall. For example, plants such as cabbage, radish, eggplant, tomato, watermelon and wax gourd, and poultry such as pigs and cows are much fatter than southerners. For Americans, northerners in China are taller than southerners. Nordic people are taller than southern Europeans and are the largest race in the world. It's mainly about latitude. The higher the latitude (north), the farther away from the equator, the colder the weather. People need to reduce the unit energy loss and increase the body surface area, so northerners are taller. On the contrary, southerners, close to the equator, have to reduce their body surface area in hot weather, so they are shorter. Viewpoint 2: 1. The Qin and Han Dynasties were the first stage: in 36 BC, Gan Yanshou, the protector of the Western Regions in the Western Han Dynasty, and Chen Tang, the deputy commander, led 40,000 soldiers to the Western Xiongnu to Zhi Zhi City (Zhanbule City, Kazakhstan) ... On the way to the war, the soldiers of the Western Han Dynasty noticed that Khan had a very strange mercenary, tall, with eyes and nose, red hair and burly figure, who lined up in a phalanx in the battle, just like the Roman imperial army at the same time. In the Battle of Tancheng, the Han army won a total victory, beheading 15 18 people, taking 145 people alive and surrendering 1000 people. Gan Yanshou and monk Chen took the prisoners back to China. And put these Romans into the army and established a county called "Li Gan" in Gansu. A passage in the Book of the Later Han Dynasty says: "Li Gan County was established in the early Han Dynasty, with the name of the country as the county." "Li Gan" was exactly what China called Rome at that time. Since it is a "named county", this new county must be set up to settle the Romans. This Roman army became the first European nation to be assimilated. 2。 The Wei and Jin Dynasties are the second stage: The Book of Jin Shi Shuo Xin Yu records East Jin Mingdi as "yellow beard" and "yellow head", which is a typical Caucasian ethnic feature. It is also called "Xianbei slave", and its mother is "Yan Dynasty" (now Beijing area), saying that it looks similar to her mother. It can be seen that the Xianbei tribes at that time, and even the natives in North China, all contained a large number of Caucasian ethnic components. In the Western Jin Dynasty, the nobles of the Western Jin Dynasty kidnapped local women from the Liaohe River basin to buy wives and concubines, mainly in pursuit of strangeness, because local women looked different from the Han nationality, with yellow hair and blue eyes, and then Mohe nationality appeared. Logically, it can be concluded that a small number of ancient Finns may have gone to Northeast Asia. As we all know, Finns are Nordic, tall and powerful, and they are Xianbei (White Xiongnu) in Northeast China. 3。 The period of Sui, Tang and Five Dynasties is the third stage: The History of the New Five Dynasties, The Appendices of Siyi and the Biography of Shiwei in the Old Tang Book and the New Tang Book all recorded "Huangtou Shiwei", also known as "Huangtou Shiwei", and Shiwei was the predecessor of Mongolian ministries. The Book of the New Tang Dynasty (volume 1 10) and Biography of Li Duozuo recorded that "Li Duozuo was the first chieftain of the clan, with the title of' Huang Toushuai', and later entered China, with a long pedigree", indicating that there were also blond tribes in the Tang Dynasty. During this period, nomadic people in the north further intermarried with Aryans in Europe, forming a brand-new ethnic composition, which laid the foundation stone for the rise of Khitan, Nuzhen and Mongolia in the future. Zhang Ji, a poet in the Tang Dynasty, recorded in his poem Yongjiaxing that "Huangtou Xianbei entered Luo" was evidenced by poetry. 4。 The Liao, Jin and Yuan Dynasties were the fourth stage: A Jurchen with yellow hair, yellow temples and green eyes was recorded in The Three Dynasties North Alliance, which was called "Jurchen with Yellow Head"; The story of Song and Mo is called "yellow hair and green eyes" in the article "Yellow-headed Jurchen". According to the article "Nuzhen with Yellow Head" in the Records of the Khitan Nation and Various Miscellanies of Guo Fan, her facial features are "yellow hair and green eyes", which is obviously a Caucasian ethnic feature. This proves that people of all ethnic groups in Northeast China have Caucasian genes more or less. Genghis Khan and his father should have blue eyes soon, and their family name "Boldin" means "blue eyes". 5。 At the end of Yuan Dynasty and the beginning of Ming Dynasty, it was the fifth stage: Mongolia conquered the Assyrians in the Caucasus during its Western Expedition. Azuth originally believed in the Orthodox Church. They are tall, fair-skinned and have blue or green eyes. Later, they joined the army, entered the Central Plains, and formed the Azzos Army, known as "Green Eye Hui". Semu people and Mongolian ancients were nobles at that time, and Han people with low status had no right to intermarry with nobles. Later, Yuan Shizu Kublai Khan ordered the garrison troops to "organize people everywhere, make up people, etc.". Most of these troops were stationed in the north, so the descendants of these early European immigrants were mainly assimilated by Mongols, Xixia people and Jurchen people, forming future northerners. 6。 The Qing Dynasty and the Republic of China were the sixth stage: Tsarist Russia carried out the policy of "Russianization of Borders" in Siberia and the Far East, which led to sporadic immigrants from as many as 2 1 countries moving into Siberia and the Far East. Most of these immigrants are Russians, followed by Ukrainians, Tatars, Finns, Poles and Caucasians. Since September 1689, the Sino-Russian border with the Ergon River was formed after China and Russia signed the Treaty of Nebuchadnezzar. Article 5 of the treaty stipulates that "all Russians in our country and all Russians in our country remain intact and need not be repatriated." This has resulted in the historical phenomenon that there are Russian residents in China and Russian residents in China. At the end of 19, with the rise of gold mining on both sides of the Ergon River, many mainlanders in Shandong, Hebei and other provinces were recruited as gold miners by Russian capitalists. 1900 During the construction of the Middle East Railway, more China laborers were attracted to the mainland. Some of them later flowed into Russian border areas to engage in gold mining, and some worked as employees for Russian government gentry and rich peasants. Because most of these China laborers are single young people, they live among Russians, have been friends with Russian girls for a long time, and then fall in love and get married, forming a family of mixed nationalities, and have also given birth to countless children. Conclusion: People of all ethnic groups in the north have been intermarriing with European ethnic groups for thousands of years, so from the genetic point of view, they have inherited the tall physique of Caucasian ethnic groups. Yellow people's muscle hormones are six times worse than those of blacks and whites, so antagonistic sports such as boxing and wrestling are generally not available to yellow people, but the average IQ of yellow people is 106, while that of blacks is106, so yellow people have the best brains. God is fair, right? Shanghainese are not purely southerners. They come from the east. Pan Changjiang is a comedy star, and so is his role. In order to make jokes, such short people can be seen everywhere in America. Zhao Benshan is not short. We should look at the whole, not individual phenomena. Generally speaking, it is true that the north is higher than the south. ① Human characteristics include body shape, appearance and skin color. China has a vast territory and a complex geographical environment. In the early days of human society, the scope of production activities was relatively small, and there was little communication between different regions. Due to the differences in climate, topography, hydrology, production activities and living habits, there are also differences in height, fatness, black and white among residents living in different areas. Later, with the expansion and migration of social production activities and intermarriage, these differences gradually narrowed, but they did not completely disappear. ② First of all, in terms of figure, there is a phenomenon that the north is high and the south is short. According to the statistics in 1980s, the average height of northerners is above1.67m, while that of southerners is below1.67m. The main reasons for the height difference are production activities and diet. Residents living in the northern grasslands and plateau areas are mainly nomadic, and rarely carry heavy objects in their production and life. Most people go out by horse, car or foot, and their legs are long and straight. Their food is mainly meat and dairy products, which are generally high. Most people living in the tropics and subtropics are engaged in agricultural production and often carry their backs on their shoulders. The main means of transportation are boats, bamboo rafts and so on. The arms are developed and the legs are short. The food is mainly whole grains such as rice, and their bodies are relatively short. In addition to the above reasons, the length of growth and development time and genetic factors can not be ignored. The climate in the north is relatively cold, the metabolism of human body is relatively slow, the growth and development take a long time, and the maturity is relatively late. At the same time, their ancestors were taller and passed down from generation to generation, while southerners were just the opposite. ③ Secondly, in terms of body shape, there is a phenomenon that the north is fat and the south is thin. There are two main reasons for the difference between obesity and thinness: one is climatic conditions. The temperature in the north is lower than that in the south, especially in winter, which is very cold. In addition, short days, snowy weather, less outdoor activities and less physical consumption of residents are all conducive to the accumulation of fat. The climate in the south is warm, and production activities can be carried out all year round. Residents have a large amount of activity and consume a lot of calories, so it is not easy to accumulate fat. The second is the diet structure. Northerners' diets contain fat, protein and other foods, especially in pastoral areas, where herders' diets are mainly dairy products and meat, which are easy to get fat and can better adapt to the cold environment; Southerners mainly eat plants, and residents have the habit of drinking tea and eating porridge. It is not easy to accumulate fat in the body, which makes them look thinner, and a thin and handsome figure is more conducive to heat dissipation. Fourthly, there are differences between northerners and Renye Fang people in facial features. Northerners have straight and long noses and narrow nostrils. For example, the average nose width of people in Heilongjiang, Jilin and Liaoning provinces is 38 mm. This nose shape can make the dry cold air in northern winter fully contact with the nasal mucosa before being inhaled into the lungs, which can not only preheat, but also increase humidity and protect the lungs. Southerners' noses are not as straight as northerners', with more upturned cartilage and wider nostrils. For example, the average width of the nose of residents in Guangdong, Guangxi and other provinces is 40mm, and the short and wide nostrils are conducive to heat dissipation and dampness. Southerners have thicker lips, and more than two-fifths of the residents have an upper lip thickness above 1cm. However, the farther north they are, the thinner they are. It is difficult to find residents whose upper lip thickness is above 1cm in the north. At the same time, the farther south you go, the more your lips protrude forward and tend to turn outwards. This is inseparable from the hot and humid climate characteristics in the south. Thick convex lips can promote the evaporation of water vapor and accelerate heat dissipation. The climate in the south is humid, with less wind and sand, wide eyes and large and round appearance; The climate in the north is dry, with less precipitation and windy and dusty weather. The eye fissure is long and narrow, the upper eyelid does not show horizontal stripes, and the double eyelids are few. The tear mound is covered with Mongolian folds to prevent wind and sand from blowing into the eyes and ensure that the eyeball surface is moist. ⑤ Finally, from the perspective of skin color, there are great differences between the north and the south and between the east and the west. The difference between the north and the south is related to the radiation of the sun. The southern latitude is low, the sun angle is high, and the ultraviolet radiation is relatively strong. The dark epidermis can absorb most of the ultraviolet rays, so that the tissues under the skin will not be damaged by too much ultraviolet rays, so the skin of southerners is darker. The northern latitude is high, the sun is low, the angle is small, and the ultraviolet rays reaching the ground are less, while moderate ultraviolet rays are beneficial to the growth and development of human muscles and bones, and light-colored skin is beneficial to absorbing ultraviolet rays, so northerners generally have light-colored skin. The difference between the east and the west is related to the terrain. In the eastern mountainous and hilly areas, there is abundant rain, dense forests, misty clouds and high air humidity, which weakens the radiation of the sun, and the human body receives less ultraviolet rays and the skin is relatively white. In the western plateau, there is insufficient oxygen in the air, and the red blood cells with oxygen transport function in the human body increase. Coupled with the stimulation of ultraviolet rays and sandstorms, the skin color is darker. It should be noted that there is no absolute boundary in the natural environment, so there is a gradual transition in human characteristics. For example, the Jianghuai area is located in the transition zone between north and south. The men here are tall and powerful in the north and lean and strong in the south. Women have both the slim and graceful figure of southern girls and the fair and ruddy skin of northern girls.