How does anthropology, as a discipline, define race?

Watch “Skin Color Is an Illusion” (link below) and read pages 76–82 and 299–304 in your textbook (uploaded)Race is a powerful and contentious topic in today’s society. How does anthropology, as a discipline, define race? Explain why it is difficult to use biological characteristics to categorize people into races.2 paragraphs please.”Skin Color Is an Illusion”https://www.ted.com/talks/nina_jablonski_skin_color_is_an_illusion