Can anyone explain how this app works just got it and what Is brainliest?

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.

Amember of congress acting as a trustee casts a vote for a bill based on his or her

The citizens if the united states live and work in a