5. Three powerful trading centers in Africa were Ghana, Songhay, and Mali. What did all three have in common? *
They all traded salt.
They all traded spices.
They all traded gold.
They all traded silk.

In piaget's stage, you would expect one to develop interest in ethics, politics, and social and moral issues.

Which of the following was a key accomplishment of the people of songhai? a. they had a strong military and became the largest empire in west africa. b. they established a center of islamic scholarship. c. they worked with iron and prospered from the gold-salt trade. d. they dominated in the trade of ivory, enslaved people, and animal skins.

When and why were fingerprints first used in the united states