of
(1) languages and metallurgical skills
(2) porcelain and cannons
(3) camels and Islam
(4) cuneiform and galley ships
Yep I have had this question and here is your answer.
Between 500 B.C. and A.D. 1500, the migration of the Bantu people of Africa led to the diffusion of "(1) languages and metallurgical skills" among other things as well.
