Key figures in the development of behaviorism include:

i think it would be   c)   the raw   materials necesarry to produce   goods

i think im right about 70%

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.