Read the paragraph. leonardo was fascinated with human anatomy. he conducted medical research in hospitals in florence and rome. his notebooks are filled with sketches of bones, muscles, and organs. for example, he made detailed drawings of a human fetus and a human heart. which sentence is the topic sentence? a. leonardo was fascinated with human anatomy. b. his notebooks are filled with sketches of bones, muscles, and organs. c. for example, he made detailed drawings of a human fetus and a human heart. d. he conducted medical research in hospitals in florence and rome.