One reason the cultures of north africa developed differently from the cultures of the rest of africa was that these areas of africa were separated by the

The cultures of the North of Africa (the Arabic speaking - people, the Berbers and Tuareg)  are separated from the Bantu-speaking South by the desert, named Sahara - this is the correct answer.

Sahara is very difficult and dangerous to cross, and it has kept the two parts of the continent separated.

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