What happens once groundwater reaches a layer of rock in the ground that it cannot pass through? a) It is soaked up by that layer of rock and dirt.
b)It creates an aquifer.
c) It creates a reservoir.
d) It evaporate
Note: I think it's b)... any idea...

well i'm late but i think its: b, c, and e

i don't know the answer to this

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.        

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.