A2-d area enclosed by a line that establishes contour is

The five possible reasons explaining why art may be created are

Bile juices in the breakdown of fats. an injury to the (liver, mouth, or salivary glands) may cause a decrease in the production of bile juices. this decrease in bile juices may lead to decreased production of (amino acids, carbohydrates, or fatty acids)

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