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Dark skin provides a selective advantage near the equator, just as light skin provides a selective advantage in northern latitudes. Explain how light skin came to predominate in northern latitudes using your understanding of natural selection.

Note: this question does not ask how different skin types are advantageous in different environments, nor how the need for melanin is reduced in the northern latitudes.  It is asking you to demonstrate an understanding of how natural selection works.
Hint: nobody changed the color of their skin or ‘adapted.’

Do not use outside sources (websites or articles) for your answers. The textbook, Knowledge Building Page notes, and videos contain enough information to complete written assignments. Please do not include quotes or citations, and please do not copy the question in your answer.  Be sure that your essays are in paragraph form, incomplete sentences,