What explorer whose last voyage ended in mutiny

What are policymakers trying to do by using the media to deliver specific messages to citizens?

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

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?