Some in the United States see parties like the Green Party or Libertarian Party as a detrimental part of a major election cycle, siphoning off votes from their close ideological "cousins" and potentially costing the election. Sociologically, however, the presence of more than two parties—a multiparty system—is vital in order to:

foster diverse interests and allow for the representation of more radical alternatives

Explanation: Multiparty system is a system which multiple political parties share power.

They tend to be quite unstable but give room for diverse interests and representation of more radical alternatives.

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.        

answer; bona fide occupational qualification; (bfoq);