What is the relationship between the distribution of ethnic groups in the world and the geographical environment?

The body shape of each race is adapted to the living environment.

Like the process of animal species generation and differentiation, the natural process of forming modern human race is still controlled by four basic factors: gene mutation, random diffusion of variation, migration and natural selection. Under the influence of these factors, all living races show different degrees of differences in some morphological characteristics and some biochemical characteristics.

The body shape of each race is adapted to the living environment; Black people living in the hot African desert have slender limbs; The Inuit living in the cold arctic have short limbs, which is related to the maintenance and emission of human heat. Black skin near the equator contains more pigments, which can avoid excessive ultraviolet radiation, and their curly hair can also play a role in heat insulation.

Extended data:

Related development of race:

1, the physical characteristics of Mongolian race, Caucasian race and black race began to appear about 35 thousand years ago. Late Homo sapiens fossils found in Asia, Europe and Africa prove their sustainable development in this region.

2. Mongols originated in Central Asia and East Asia. Late Homo sapiens skull fossils found in Zhoukoudian Cave in China and Tongtianyan in Liujiang County, Guangxi, show the characteristics of yellow race.

3. The history of Mongols sailing from Indonesia or other places to Australia may be earlier than that of going to America. The human fossils found in Lake Mungo and Coa swamp in Australia represent two different types, so some people think that there have been two migrations from Asia to Australia.

The genetic relationship between African blacks and late Homo sapiens found in this area is obvious, and most people think that they originated in Africa. However, the variety differentiation in this area is late.

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