text: The face and body of the Oriental people result from adaptations to the bitter cold. The body, and particularly the head, tends to be round, increasing body volume. The evaporative surface area of the skin is thus reduced relative to body volume, and less heat is lost. The nose is small and less likely to freeze, and the nostrils are narrow, warming the air before it reaches the lungs. Eyes are protected from the cold air by fatty folds of skin. Racial differences also result from the particular tastes of individuals via sexual selection.\n\nThe reason why white people don't have slanted eyes is because they probably evolved in a warmer climate, more like modern day Germany or Michigan in the US, which had cold winters and warm to hot summers, hence they didn't need protection from the year round severely cold climate/elements. It would also explain their comparatively more linear body structure. The climate they evolved in was probably a rainy one without a ton of sunlight, and they also must have lacked a significant source of vitamin D to consume and so they evolved lighter coloring to absorb more Vitamin D during the long Spring, Winter and Autumn months.