Final answer:
Islam spread through North Africa by conquest and south of the Sahara by trade, and while Ghana's rulers eventually converted to Islam, many people in Ghana kept their animistic beliefs and practices.
Step-by-step explanation:
True. Islam spread through North Africa by conquest and south of the Sahara by trade. While the rulers of Ghana eventually converted to Islam, many people in Ghana maintained their animistic beliefs and practices. The spread of Islam in the region was not universal, and a significant portion of the population never converted.