How did the geography of Greece limit and invite interaction with other civilizations?

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Explanation:

Some cities, like Athens, were surrounded by hills on all sides except one side by ocean.  This made Athens quite secluded, physically.  However, they overcame that by building boats.  Other cities on plains/valleys, such as Sparta, had easy access to wide areas of land, but did not often interact much.

answer; i believe that the correct answer is (tobacco);

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