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The aspect of of instruments that improved during the Romantic period was the valves. The correct answer is D, valves.
Answer: Modern art includes artistic work produced during the period extending roughly from the 1860s to the 1970s, and denotes the styles and philosophies of the art produced during that era. The term is usually associated with art in which the traditions of the past have been thrown aside in a spirit of experimentation.
Explanation:
Draw an wavelength it creates equal rhythm throughout
