Because of the Mexican-Americn War, what 2 future states did the U. S. gain?
Texas and Oregon
Texas and Alaska
Texas and California

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 can !    

- jack watson

answer; an active listener;

answer; exploratory;