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These four subsystems are called "spheres." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air). Each of these four spheres can be further divided into sub-spheres
If resources get low, the population's numbers can decrease.
Western European nations maintained democratic political systems.
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Don't know <u>language</u><u> </u><u>ok</u>
