Help pls Why was it difficult for Congress to fulfill its duties under the Articles of Confederation?
Congress lacked the power to declare war.

Congress lacked the power to regulate foreign trade.

Any congressional action required executive approval.

Most congressional decisions required the approval of at least nine states.

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?