How has modernization changed agriculture since the Great Leap Forward? a. no more communal farms
C. contract responsibility system
b. increased production
d. all of the above
Please select the best answer from the choices provided
OA
OB
Ос
OD

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?