Black immigrants and yellow immigrants

This is mainly determined by human genes, and not all people originated in Africa.

We all know that water is the most important source of ancient human origin. Only in areas with water sources will humans gradually emerge. For example, the Yangtze River and Yellow River basins in China are the cradles of human origin, not Africa. There was a Nile civilization in ancient Africa, which later developed into ancient Egypt and established a unified dynasty. Why do some people say that human beings originated in Africa? The main reason is that when scientists examine human genes, they find that both yellow people and white people carry ancient human genes, and African blacks are the most, so some scientists think that all human beings originated in Africa in a whimsical way (with all due respect, I think this guess is silly).

If human beings really originated in Africa, how can we explain the 5,000-year-old civilization in China? As early as 4000 BC, China discovered the ruins of ancient human existence. With the continuous development, China was one of the first countries in the world to establish slavery. Even though there may be more ancient human genes among African blacks, we can't take it for granted that the world human beings originated in Africa because of this element. I think it is African scientists who say this conclusion.

People's skin color difference is mainly due to different genes in the body, but sometimes genetic variation may produce different results, such as Michael Jackson, who is black, but because of albinism, this person's skin color presents more white characteristics, which is that the disease destroyed his gene chain and caused the skin color difference.

In a word, I think it is sheer nonsense to say that human beings were born in Africa. The survival traces left by the four ancient civilizations in the world are more favorable evidence, and the difference of human skin color is caused by the different genes of people in different regions.