Answer:
1.) Islam was introduced by traders of Sahelian tribes of West Africa. The introduction of Islam into Ghana was mainly the result of the commercial activities of Mande and Hausa Speaking traders.
2.) Musa (Musa I of Mali) was the ruler of the kingdom of Mali from 1312 C.E. to 1337 C.E. During his reign, Mali was one of the richest kingdoms of Africa, and Mansa Musa was among the richest individuals in the world.