(15*30/5) please hurry I'm stuck in this ​

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.

Why is mary salter ainsworth a central figure in psychology?

Which of the following could be considered both renewable resource in a nonrenewable resource