The government has different agencies responsible for protecting the many cultures represented in America. Explain the roles of the National Endowment for the Arts, the National Endowment for the Humanities, and the National Archives and Records Administration.

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?