Why are people's faces different?

There are two views in academic circles. The first view is Darwin's theory of natural selection. According to this theory, adaptation is a common phenomenon, no matter the morphological structure, physiological function or behavior habit of animals, plants or microorganisms, without exception.

Face is also the product and result of human adaptation to the environment. The noses of southern Africans are low and short, while those of Ethiopians are high and long, which is due to Ethiopia's high altitude and cold climate. A tall and long bridge of the nose can increase the volume of the nasal cavity, and treat the inhaled cold air to make it warm and moist, so that it will not destroy the function of the lungs after entering the body. The same is true of people with high noses in northern Europe.

The oblique phoenix eye, eyelid wrinkles and long eyelashes of the yellow race may be related to the sandstorm in Central Asia. This structure can protect eyes from wind and sand.

The second view is "neutral catastrophe theory". From the molecular level, most mutations have neither beneficial effects nor adverse consequences on the survival of organisms. Therefore, such mutations are "neutral" in natural selection.