Different Skin Tones

Different skin tones in humans are associated with the sun's UV radiation and geography. UV rays can be used by the human body as a source for Vitamin D, which helps make bones stronger by taking in the calcium necessary to create stronger bones. A ton of sun exposure that's especially strong can be damaging to the human body, especially the skin. To solve this problem, evolution created a skin tone that was already dark in areas with strong sun exposure to protect the skin from the dangerous rays that came from the sun. Melanin is the skin's brown pigment that acts as a protectant for the skin against the sun's rays. Of course, it doesn't completely shield the skin because Vitamin D still needs to get into the body. When people tan,