I believe the answer is 4. During the reign of Askia Muhammad, the Songhai empire reached its greatest size.
Askia Muhammad was an emperor, military commander, and political reformer of the Songhai Empire in the 15th century. His rule resulted in trade with Europe and Asia, building of lots of schools, and spread of Islam through his empire.
Hope this helps! Please let me know if I'm wrong :)
Definitely: social organization of clans and tribes and moved around a lot. Might be livestock was only surplus if you mean that livestock was kept from season to season.
Answer:
The sun warms the Earth and as it rotates, different regions get different temperatures.
Explanation: