In 2–3 sentences, explain the usefulness and variability of agricultural density with reference to three countries.

Agricultural density is useful in understanding the level of agricultural activity in a country and its potential for food production. For example, countries like the United States, Argentina, and Australia have low agricultural densities, indicating a higher potential for agricultural expansion due to their vast land availability. Conversely, countries like Bangladesh, India, and Japan have high agricultural densities, highlighting the need for maximizing limited agricultural land to meet food demands.