The general relationship between classes in which one class is a part or component of another class is called a(n) relationship.

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.        

if im not mistaken its a. collective emotional arousal