Na laboratory, smokers are asked to drive using a computerized driving simulator. they are asked to cover the maximum distance possible, while avoiding rear-end collisions. some volunteers are given a real cigarette to smoke immediately before the test. others are given a fake cigarette without nicotine. the number of collisions the two groups make will be compared. in this study, the cigarette without nicotine is a(n):
dependent variable.
placebo.
double-blind procedure.
hypothesis.

The persians landed in the plains near athens. as their army greatly outnumbered that of the greeks, the greeks hoped to find aid from nearby sparta. a long-distance runner named pheidippides was sent from athens to sparta to request , but the spartans were not able to send more soldiers at the time. regardless, the greeks were still able to win the battle. centuries later, legend developed that a runner had been sent from the battle to athens after the greek victory. after reaching athens, the runner proclaimed, "we are victorious! " and then fell to the ground and died. this legendary story is the inspiration for the modern long-distance runs that are performed today. this passage refers to the events of which battle during the persian wars? a. battle of thermopylae b. battle of salamis c. battle of plataea d. battle of marathon