Humans in the world come from the same ancestor, and the long living environment has caused the differences in the appearance of various races today. For example, people who live in high latitudes in the north for a long time have less sunshine and white skin. Because of the cold, their noses are very long to warm the air they breathe. They are used to hunting, eat more animal protein and grow very tall. Tropical sunshine is strong, dark skin is beneficial to resist ultraviolet rays, and the curl of the head can reduce the evaporation of water. Mid-latitude people are neither black nor white, neither tall nor short when the climate is suitable. Although there are great differences in appearance between different races, the genetic difference is less than 0.0000%.

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