What was the structure of government in the Roman Republic? What similarities are there to the U. S. government?

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.        

this doesn't support enough information to answer the question.

answer; criterion validity

answer; can have a long term impact on the newborn;