Place the following events in sequence: a) air pressure inside your
lungs drops: b) the diaphragm contracts; c) air from outside rushes
into your lungs.
a. A, B,C
b. B. A.C
c. C, A, B
d. B, C, A

C

Explanation: Air from the outside should come into your lungs before anything happens. Next the air pressure inside your lungs drops and when that happens your diaphragm contracts.

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.