Which of these is not a prerequisite ( requirement) for a trading nation?

a) a merchant class b) a well developedd transportation system c) a central location relative to markets d) abundant raw materials e) excess capital

When in college, greg dreamed of rowing in the olympics and becoming a surgeon. now at age 48, he continues to enjoy rowing, although he never made it to the olympics and he works as an anesthesiologist. his wife and kids are healthy and he is basically content. according to erikson, he is most likely to experience

Why learning about people and places around is important?

The authors of the paper "fudging the numbers: distributing chocolate influences student evaluations of an undergraduate course"† carried out a study to see if events unrelated to an undergraduate course could affect student evaluations. students enrolled in statistics courses taught by the same instructor participated in the study. all students attended the same lectures and one of six discussion sections that met once a week. at the end of the course, the researchers chose three of the discussion sections to be the "chocolate group." students in these three sections were offered chocolate prior to having them fill out course evaluations. students in the other three sections were not offered chocolate. the researchers concluded that "overall, students offered chocolate gave more positive evaluations than students not offered chocolate." indicate whether the study is an observational study or an experiment. give a brief explanation for your choice.