What happens to the individual demand curve as the price of an item increases?
a. an individual demand for an item will increase causing an upward slope.
b. an individual demand for an item will decrease causing a downward slope.
c. an individual demand will increase, causing the price to increase further.
d. an individual demand curve will remain unchanged and price is never a factor.

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.        

sumerians were polytheistic, meaning they believed in many different gods. so, the best answer is c.