Human Variation & Race
Humanity is very shallow species from a genetic perspective, in that most variation in our species is only skin deep. But this lack of genetic difference has granted us the ability to rapidly adapt to varying environmental conditions which has made it possible for us to survive in most regions of the world without to much discomforts. Adaptability to specific environmental stresses like say from high levels of solar Radiation, varies from person to person and from population to population. So to increase success for the population and to avoid or prepare for future challenges and obstacles like say to avoid vitamin D deficiency that can cause the bone disease known as rickets from occurring due to lack of sunlight entering thru your skin, you could consume a diet rich in vitamins D to compensate, or move closer to the equator where Ultraviolet radiation is more present. These environmental stresses are the cause of what little variation we have thanks to our four forms of ad...