Before a bill is sent to the White House for the president’s signature, it must first?

Which of the following starements is true based on the above information?

In 1866, a mob in which tennessee city attacked local african americans and burned down homes and schools?

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?