Use the map to answer the question.

A map of the world is shows farmers per square kilometer of arable land. According to the data shown on this map, some countries with the greatest density of farmers include India, China, Mali, and Egypt, while the countries with the smallest density of farmers include Argentina, the United States, and Australia.

Answer each of the following items.

In 1–2 sentences, identify why geographers evaluate countries in terms of agricultural density?
In 2–3 sentences, identify whether human actions influence agricultural density? If so, how?
In 2–3 sentences, explain the usefulness and variability of agricultural density with reference to three countries.