Explain why variation in skin color is of no use in defining human races.

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Instructions:
You need to answer the following questions.
This is an opportunity for you to synthesize your readings and discussions into coherent essays. You should aim for one to two well developed paragraphs in order to properly answer each question.
2) The concept of descent with modification, or evolution, has a great deal of evidence in its support. Indicate the major types of evidence.
3) In what ways is the human primate a typical primate? In what ways is the human primate unique?
4) Distinguish between members of genus Australopithecus and Paranthropus in terms of time, location, and physical features.
5) Explain why variation in skin color is of no use in defining human races.
The main source for this essay is the class textbook, here is the information:
Park, M.A. (2013). Introducing anthropology: An integrated approach, with PowerWeb, 6th Edition. New York: McGraw-Hill. ISBN 0078035066.
i need two more sources. Please make sure that i can find the outside sources and be able to read them
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