7. Why do you think the Byzantinos prosorved Greek culture instead of just Roman culturo?

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 is not a question

answer; many cognitive abilities emerge earlier in children than piaget though;