The cities listed above were all wealthy Muslim city-states along the east coast of Africa. Which industry contributed most to the economy of these city-states? A. fishing
B. overseas trade
C. banking
D. agriculture

As you drive down the highway, a child in the back seat asks why the tall buildings downtown are moving so slowly when the roadside is moving so quickly. because you have read your psychology text, you are able to answer her question by responding that this is an example of: