What did Zhou dynasty use to help them maintain order. slaves

trade

nobles

irrigation

the answer should be Delegating regional control

but in your question it doesn't show this word !!

question 1:

senate and house of representatives

i would try to answer the second question but i’m not 100% positive but i hope i

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.