Are races different because of different geographical environments?

(1) Now human beings are all the same species, called Homo sapiens. People with different physical appearances are created because they have adapted to different natural environments for a long time and evolved different characteristics.

For example, white people's noses are very high, which is a feature that they gradually evolved to adapt to the cold climate in order to better moisten and warm the air entering the lungs.

On the contrary, blacks don't need to adapt to the hot weather for a long time, so their noses are not high, but the ultraviolet radiation in places where blacks live is much stronger than in high latitudes. So blacks need more melanin to protect their skin, which is why they are black.

There are many examples If you are interested, please refer to my previous answer. In a word, all features are the product of gradual evolution (more precisely, evolution) after thousands of years or even longer.

(2) White Australians immigrated from Britain in the19th century, and there were several waves of immigrants from Europe in the 20th century, so there were many white Australians there.

And this short period of one or two hundred years is not enough for a species like human beings to evolve black skin.

More importantly, there is no power to push those white Australians to evolve black skin now. Because of sunscreen, comfortable houses and advanced medicine, it can be said that the power of natural selection to evolve black skin has been interrupted.

(3) Yellow people are not their excesses. All races are independent and formed according to their own environment.

(4) According to the mainstream African origin theory, some modern Homo sapiens migrated from East Africa to the Middle East about 60,000 years ago.

Later, it was divided into two branches, one eastward, and after a long migration, it reached Asia, the Pacific Ocean and America.

The other one went north, then west, and arrived in Europe.

Of course, some of them stayed in Africa and later spread on the African continent.