Why is food production an issue in the middle east , and what are countries doing to solve this problem

Who was the better president between richard nixon and john adams in terms of accomplishments ?

What is the largest room in the white house

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?