Help me please Why is trade one of the major causes of cultural diffusion? A. Traders can show new inventions to a country. B. Trade is controlled by countries with large armies. C. Trade only takes place between wealthy countries. D. Traders are usually powerful religious leaders.

Dr. robbins wants to know if there are different opinions regarding the value of public school education between native americans who have at least one relative who attended indian boarding school and native americans who have no family experience with indian boarding school. dr. robbins contacts 35 native american participants in each group. he wants each group to include younger as well as older adults, and a mix of male and female participants. he asks each person to complete a survey about their attitudes toward public education. the design of this study is: