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Since the yellow race and the white race have the same ancestor, how do they distinguish them?
Racial differentiation is due to the adaptation and formation of different environments.

In fact, the environment faced by yellow people and white people at first is very different, and of course there are black people.

Caucasians (white people) originated in low-lying areas with cold and weak sunshine.

The yellow race (that is, Mongolians) originated in the plateau area with strong wind and sand and strong sunshine.

Black people (that is, black people) originated in relatively warm, humid and bare places near the equator.

Let me give you a few examples:

(1) skin color

Melanin has the ability to absorb ultraviolet rays from the sun. Black people who crossed the equator and originated in Africa have dark skin, which can prevent their skin from being damaged by excessive ultraviolet rays. Ultraviolet rays can stimulate the production of vitamin D. Therefore, dark skin can prevent vitamin D poisoning caused by excessive vitamin D production.

On the contrary, Caucasians originated from higher latitudes, where the sunlight is not as strong as near the equator, and the amount of ultraviolet rays in the sunlight is also less, so there is little melanin in the skin of Caucasians, especially the Nordic type. And the yellow race is between the first two ~ ~, so the skin color is also between the two ~ ~ ~

(2) Nose shape

The same is true of the nose type. Black people originated in the tropics, while people living in the tropics generally have wide nostrils; The climate here is warm and humid, and the role of warm and humid air in the nose is not very important, so people in this area have flat noses and wide noses.

Caucasians from high latitudes and cold climates have straight and narrow noses, because this can help them better warm and moisten the inhaled air and protect their lungs. And the yellow race is between the first two ~ ~ ~

(3) eye fracture

Because the yellow race originated from the Mongolian plateau with more sandstorms, the yellow race's eyes are obviously broken, which is to prevent sand from being blown into their eyes.

Blacks and whites don't have to worry about sandstorms, so there will be no eye breaks.

Of course, the evolution of these characteristics is quite long, hundreds of thousands or even hundreds of thousands of years.