The Federal Reserve sells large amounts of treasury securities in order to: A. enforce regulations on its member banks.
B. pressure banks to lower their discount rates.
C. encourage banks to lend more money.
D. reduce the available money supply.

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.        

sounds good to me mate!

i believe

clean air is essential for health and survival

clean air provides nitrogen gas for plant respiration

clean air supplies oxygen that enables living organisms to breathe

hope this

i am brianly

sorry if this doesn't