How did black codes restrict the freedom of freedmen?

Select the word from the list that best fits the definition to be saved from sin and allowed to enter heaven

Experiment to investigate effect of medication on levels of stress in males and females. dependant variable?

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?