Ricardo always gets nervous when his professor says the word exam, but he seldom feels the same anxiety when the professor mentions the word quiz. The difference in his response between these two words can BEST be identified as an example of:

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Americans often speak of their country as one of several large regions.  these regions are cultural units rather than governmental units --  formed by history and geography and shaped by the economics, literature and folkways that all the parts of a region share. what makes one region different from another? a region's multicultural heritage as well as distinct demographic characteristics like age and occupation make regions different and special. within several regions, language is used differently and there are strong dialects. there are also differences in outlook and attitude based on geography.