Write out a short answer to the following questions.

1		What are the two approaches anthropologists have historically used to study human biological diversity?
2		How does skin color influence the production of vitamin D?
3		How did people come to live at extremely high elevations? And how do they cope with less oxygen?
4		How has humankind maintained a single species?
5		How do the ABO blood groups figure into human resistance to smallpox?