How was democracy developed in the southern colonies?

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; /// haptic;

answerthomas malthus wrote an essay on the principle of population;

hope this ,(malthus)