In what way was the charter of the united nations a chnage from the covenant of the league of nations? You may use the following information to help you with your answer and any other information of your own.
- The aims of the united nations
-The big four-USA, UK, USSR, China
-Collective security
-Requirements for members to provide arms

(Length: A page and a half)

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?