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,
it is usually due to the number/size of melanin granules increasing because of ultraviolet radiation and the stimulation provided by it. Both lighter and darker people have melanin, but there are two forms of it. Not every human being has the ability to tan though. For example, some Northwest Europeans tend to burn and peel instead of tan. This partially is just a result from natural selection that's relaxed. Nature usually requires less melanin for people who are surrounded by weak ultraviolet radiation.These people are also more prone to get skin cancer. People who tend to live in colder areas of the world with less sunlight, often have lighter skin tones than those living closer to the equator. Another factor that can affect skin tone includes what you put into your body. An example is a specific group of people, the Inuit people, living in the American subarctic. They live far in the north but still have strong, heavy skin pigments. They make up for their loss of Vitamin D that they would have gotten from the sun, by often eating fish and sea animal blubber that have high amounts of Vitamin D in them.
it is usually due to the number/size of melanin granules increasing because of ultraviolet radiation and the stimulation provided by it. Both lighter and darker people have melanin, but there are two forms of it. Not every human being has the ability to tan though. For example, some Northwest Europeans tend to burn and peel instead of tan. This partially is just a result from natural selection that's relaxed. Nature usually requires less melanin for people who are surrounded by weak ultraviolet radiation.These people are also more prone to get skin cancer. People who tend to live in colder areas of the world with less sunlight, often have lighter skin tones than those living closer to the equator. Another factor that can affect skin tone includes what you put into your body. An example is a specific group of people, the Inuit people, living in the American subarctic. They live far in the north but still have strong, heavy skin pigments. They make up for their loss of Vitamin D that they would have gotten from the sun, by often eating fish and sea animal blubber that have high amounts of Vitamin D in them.