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A deficiency of folates, for example, more frequently causes women to give birth to children with spina bifida, and causes men to be less fertile. Others migrated north. It is able to withstand ten times more sun than white skin before the skin burns. This perhaps has a similar purpose, since it does not protect hereditary material in the skin very well, whereas the skin colour we are born with does. Dark skin absorbs most light before it reaches the hereditary material. Dark-skinned immigrants even today encounter the same problem when they come to our unsunny country. Rapid changes in nature demanded quick adaptation and well-functioning brains, which in turn demanded steady blood temperature.

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In an evolutionary perspective, women may be more important to keep healthy than men. Evolution has given us shades of skin colour from black to white, optimally adapted for us according to where we live on Earth. So evolution has brilliantly arranged that light skin, in regions lacking sun, absorbs more UV for the production of Vitamin D than dark skin. The agricultural revolution came from the Middle East about 11, years ago and brought with it a diet of grain and meat at the expense of fish, and, as a matter of fact, our Indo-European language. These, along with blood vessels in the naked skin surface, were easily damaged by the hot sun of the equator, and thus dark skin began to evolve. It is able to withstand ten times more sun than white skin before the skin burns.

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As soon as we get out into the sun, the melanin in the skin begins to darken, but it becomes lighter again when we go indoors. They were strong and had large brains, but they died out during the Last Ice Age. Folates are needed in vital processes during cell division. It is able to withstand ten times more sun than white skin before the skin burns.

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Description: They change according to sun conditions. Skin colour has two balancing effects. The answer lies in the skin's need for protection against solar radiation and the body's need for vitamin D. It is able to withstand ten times more sun than white skin before the skin burns. But cancer cells also need folates, and one form of treatment is based on reducing the effect of folates through medication. It has been proven that Vitamin B substances are particularly sensitive to solar radiation, but other vital substances in the blood can also be broken down by a large amount of sunlight. About , years ago the Neanderthals came to Asia and Europe and endured for more than , years. Human migration can be mapped by examining genes. For employees Norwegian website.
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