In which TWO ways did the invention of the cotton gin change the South? A The Southern economy became more diversified. В. Slaves in the South had to do less hard labor. C. The South's farmland was overused and ruined. Cotton production became much cheaper. E. Cotton became the United States' leading crop.​

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.

The north american colonies experienced a steady increase in population since the first settlement in jamestown in 1607. by 1775, the colonies' population was around 2,500,000, and most of the colonists lived east of the allegheny mountains. how did geography influence the settlement of america's first colonies?

A. the constitution goes into effect. b. samuel adams agree to support ratification of a bill of rights is added. c. virginia and new york refuses to hold conversations ratify the constitution. d. states begin holding conversations to debate ratifying the constitution.