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The word Aryan has a long history. Initially, it was used to refer to groups of people who spoke a variety of related languages, including most of the European ones and several Asian ones. Over time, however, the word took on new and different meanings. In the late nineteenth and early twentieth century, some scholars and others transformed the Aryans into a mythical “race” that they claimed was superior to other races. In Germany, the Nazis promoted this false notion that glorified the German people as members of the "Aryan race," while denigrating Jews, Black people, and Roma View This Term in the Glossary and Sinti (Gypsies) as “non-Aryans.” 
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Right choice is:
b. to collect scientific and practical information of the land.
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The main purpose of the expedition was to explore and map the new territory recently acquired, the Louisiana Purchase, find a route to the West and the Pacific and establish an American presence before Britain or other powers would do it. The secondary goals were scientific and economic: to get to know the flaura and the fauna and make trade contacts with the Indians. 
 
        
             
        
        
        
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In the 1920s, Harlem in New York City became the unofficial capital of black American culture, a hotbed of intellectuals, artists, and musicians.
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i dont know,maybe the person below will give you the answer
 
        
             
        
        
        
The answer is I: Linear perspective useslaws of math to realistically show space and depth in art. Renaissance artists were largely concerned with painting real looking scenes, and linear perspective gave them a reliable method to accomplish thisauthenticity, which helped make their paintings all the more captivating!