Why is the dash being used in the passage?
"we need groceries-milk, eggs, cheese and butter."

Around the third week of a college class, a professor decides she’s had enough, is tired of dealing with bureaucracies, and wants out. so one day, instead of coming to class, she flies to tahiti and sells souvenirs on the beach. if this happened, the college would simply assign a substitute to finish the course. what does this tell you about the nature of the authority wielded by a professor?

What caused the settlement of more african americans in the mississippi alluvial plain region then in the ozark mountains region?

Where is sub-saharan africa located?