The rise of industry in the 1800s caused a migration from the cities to rural farms. true or false

Political boundaries are determined by the political party in control at all time true or false

Me asap worth brainlieist and 50 points

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?