how does human skin color show the connection between environment and fitness for people who live primitive lifestyle?(stone age technology)?
How does human skin color show the connection between environment and fitness for people who live primitive li
It doesn't have to do with lifestyle.
Humans originated in Africa with dark skin while living in a climate where there was 12 hours of sun every day of the year.
As people moved north into Euorope where there were shorter daylight hours in winter, they needed to be able to absorb more sun during the short daylight time. This is because sun on the skin produces vitamin D for the body. The farther north and the darker the skin, the poorer the survival rate and the lower the number of successful offspring. Over lots of years, those with lighter skin absorbed more sun and thus were less vitamin D deficient with the result of lighter skin meaning better survival rates and more offspring.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment