What are three characteristics of grain?

Three key characteristics of grain are its nutritional composition, which typically includes carbohydrates, proteins, and dietary fiber; its physical structure, often comprising a hard outer shell (husk), a starchy endosperm, and a nutrient-rich germ; and its versatility in cooking and processing, allowing it to be used in various forms such as flour, whole grains, and cereals. Additionally, grains can vary in color, size, and flavor, influencing their culinary applications.