Dr. Beckerman argues that a separate youth culture has emerged in the United States and that it is harmful. What findings from recent studies counteract her belief

i believe your answer is true

sorry if wrong

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.        

it looks like its all of the above. [.wpal1kojopfdpojfrfionrnif.knfdsnksjosjo]

explanation:

you have to combine all of your answers together to

.wpal1kojopfdpojfrfionrnif.knfdsnksjosjo