What African civilizations benefited from the Nile River?

Egypt grew wealthy from the gold found in Nile River sediment What did the Nubians receive from African countries, other than Egypt, when they  Other civilizations also benefited from the knowledge of the Egyptians.

hoped this helped :D

the answer is c     : )

explanation:

i don't have an explanation because i don't know, but i think the answer is c because i googled it and google is right : ) just kidding google isn't allways right but the answer is still c. i hope this !