United Nations membership is open to a.
all democratic states.
b. all European nations.
C. all Western nations.
d. all peace-loving states.
Please select the best answer from the choices provided

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

i would say b. research typically uses a variety of sources

answer; develops policy;