Adirect result of the battle of fort sumter was that

a. lincoln only asked northern states to supply troops.

b. confederate states refused to send troops to the us army.

c. six additional states seceded from the union.

d. lincoln called for volunteers for the us navy.

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?