The British blockade prevented food and raw materials from reaching the Central Powers. Germany’s ships from entering their own ports. Germany from collaborating with the Central Powers countries. ships from leaving German ports to fight the Allies.

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.        

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answer; code of federal regulations;