Tại sao người Bắc Tây Nguyên lại ở nhà ngắn ?

answer; ///it examines the interaction between genetics and culture in shaping human biology;

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.        

well its not not rising unemployment and falling inflation.

hope this good !