I cause acid rain . A) water pollution B) air pollution
C) land pollution. D) noise pollution

answer; the basal forebrain;

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.        

where are the choices

answer; u.s senate;