Of the many influences that shape relationships, your book describes four that are particularly critical for building and sustaining satisfying personal relationships. They are:

georgians assisted in financing united states war effort during world war i through both of the following options:

they bought war bonds from the government.

and

they gave food through the creation of victory/liberty gardens.

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; dr.black,who allows only certain individuals to mate;