Question

which region is least likely to have a high physiological density?
western europe
east asia
south asia
great plains
china

Explanation:

Physiological density is the number of people per unit of arable land. The Great Plains (in the US/Canada) has large areas of arable land and relatively lower population density compared to regions like East Asia, South Asia, China, or Western Europe (which, while less dense than the Asian regions, still has more intensive land use for agriculture relative to the Great Plains' agricultural - focused but sparser human settlement in terms of physiological density context). Western Europe has moderate to high population and arable land use, East Asia (e.g., Japan, Korea, parts of China) has high population and intensive arable land use, South Asia (India, Pakistan, Bangladesh) has very high population and pressure on arable land, and China has a large population with significant arable land use. The Great Plains, being a region with extensive farmland and lower population concentration relative to these other regions, is least likely to have high physiological density.

Answer:

Great Plains