The aspect of of instruments that improved during the Romantic period was the valves. The correct answer is D, valves.
Answer:
To understand further why you need to think beyond the five-paragraph essay, imagine You already know that each paragraph should be roughly 75 to 200 words long. ... Your paragraphs should be two-third of a page at most, and never longer ... Biographies and memoirs are examples of factual stories
Explanation:
