The population of African slaves grew significantly between the years of 1601-1750. This is linked to a)The growth of agriculture (farming) in the Americas and West Indies
b)The decline in the population of Europe following the Black Death
c)The emergence of an international anti-slavery movement
d)The decrease in available farmland in West African countries
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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?