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What should i say so i can switch my instrument

Type the correct answer in the box. spell all words correctly. what did german psychologists develop in the 1920s to describe how people tend to organize visual elements into groups? describe how people tend to organize visual elements into groups, or unified wholes, when applying certain principles.

In a paragraph of no less than 125 words, explain the single most important factor involved in advancing american classical music in the twentieth century.