What creates similarity between regions?

in a country that covers over 9 million square kilometers, it is not surprising to learn that regions that are separated by large distances will be noticeably different. Not only are there great differences in climate and landscape, but also in the people who live in each of these regions.

Explanation:

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A region can be defined by natural or artificial features. Language, government, or religion can define a region, as can forests, wildlife, or climate. ... Due to plate tectonics, or the movement of the Earths crust, geographic regions are constantly being created and destroyed over time

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the answer is:

c. islam and christianity

explanation:

islam and christianity are widely practiced in africa. islam is practiced due to its spread from the middle east into africa, and christianity is practiced due to the colonization of africa by the british empire.