Why was northern Africa isolated from the rest of the continent? A. Conflicting religious beliefs separated Muslim kingdoms in the north from the rest of Afric

B. The Zaire River was a natural barrier from the rest of the continent.

C. The Ethiopian Highlands were a natural barrier between North and South.

D. The Sahara Desert was a natural barrier from the rest of the continent.

D

Explanation:

The Sahara becomes the almost impenetrable barrier which throughout recorded history has separated the Mediterranean coast and north Africa from the rest of the continent. At much the same time north Africa becomes the site of one of the world's first great civilizations, Egypt.

because the earth is a round globe. but that is just what they tell us it is flat and those dudes actually where lying they sailed east.