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Key Terms
Ecumene
The permanently _ portion of the Earth's surface.
Arithmetic Density
The total number of people divided by the total _ area.
Physiological Density
The total number of people divided by the amount of _ land (suitable for growing crops).
Agricultural Density
Measures the number of _ per unit of arable land, indicating farming efficiency.
Carrying Capacity
The maximum population size that the environment can sustain _.
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