After reading this chapter, you should be able to:

6.1 Identify the different sources of human variation.
6.2 Provide examples of how physical characteristics in human populations may represent adaptations arising from natural selection.
6.3 Describe how environmental factors may be sources of evolutionary change.
6.4 Explain how cultural factors may be sources of evolutionary change.
6.5 Summarize the challenges faced in dividing human populations into different races.
6.6 Discuss how contemporary anthropologists assess the relationship between intelligence
and race.
6.7 Compare current approaches to human variation.