Diamond

     According to Diamond, there are many different ways to define races based on different classifications, and many anthropologists conclude that one cannot recognize any human races at all. For instance, we can classify races based on skin color, geographic location and visible physical characteristics, digestion, fingerprints and genes. Traits vary because of natural selection, sexual selection, and mutation. And Diamond implies that we cannot define races and humans do not have races.
     I think Diamond's argument is persuasive and I agree with his opinion. A main reason is that I have continued to doubt about racial classification based on skin color, because all of "white", "black" and "yellow" do not have difference in their ability based on their skin color. The only difference I know is their external appearance.