Which type of government is described by the characteristics listed below? centralized; government in one location; one authority
a. unitary
b. federal
c. democratic
d. confederate

answer; ///it examines the interaction between genetics and culture in shaping human biology;

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.