Final answer:
The theme of geography best described by the statement is Region.
Step-by-step explanation:
The theme of geography best described by the statement is Region. The steppes, which include parts of Mongolia, western China, and Tibet, have small populations, indicating that this is a specific area with distinct characteristics. The theme of Region in geography refers to areas that share common physical or cultural characteristics. In this case, the steppes share the characteristic of having small populations.
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