Write a 200 – 250 word short essay in response to the following question. Your essay must be in paragraph form. Submit your work in Drop Box 4.

Question #4: Dark skin provides a selective advantage near the equator, just as light skin provides a selective advantage in northern latitudes. Using your understanding of natural selection, explain how light skin came to predominate in northern latitudes.
Note: this question is not asking how different skin types are advantageous in different environments. It is asking is asking you to demonstrate an understanding of how natural selection works.