How did climate change affect early people migration

Which type of evidence would support the author's claim?

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.

In ancient egypt, the pharaoh collected from the peasant farmers. a. oil b. gold c. lumber d. taxes