The tablets of gold, silver, and wood the Mongols issued as passes to traders represented different... *
languages spoken by the traders
types of goods that the traders carried
O regions of the empire, from east to west
O levels of privilege, from highest to lowest

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hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.