1. 人工授精步骤过程图_苦瓜网_小可和淑芬小说阅读

          How easy is it to group people into “races” based on appearance? What about using individual traits? Does everybody classify the same way?

          Try your hand at "sorting" individuals and see if it matches how people think of themselves. Or explore how we might sort people by physical traits.



          Activities require the Flash 6 plugin.

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