Which of the following allowed civilization to begin in Northern Africa? People found a way to accommodate to life in the desert.
The majority of the Sahara Desert was dry like it is today.
People created tools that allowed them to live in the desert.
The majority of the area that is now the Sahara Desert was a lush prairie and full of wildlife

Successis toeffort as failure is to: a, devotion b, disaster c, chance, laziness

These facilities were organized and sponsored by churches or charities during the great depression in an effort to feed the homeless and needy.

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.