Answer:
I think...
Explanation:
Humans first evolved in Africa, and much of human evolution occurred on that continent. The fossils of early humans who lived between 6 and 2 million years ago come entirely from Africa. Most scientists currently recognize some 15 to 20 different species of early humans.
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The GI Bill provided soldiers returning from World War ll assistance with going to college. This gave America a generation of educated and more qualified individuals who went into white-collar jobs.
Answer:
decrease in sea levels
increase in vegetation
warmer global climate
Explanation:
This all helped in making human surivial easier.
Social classes: King
Priests
Scribes
Merchants & Artisans
Commoners
Slaves
Economic classes: calendar and irrigations (via canals and ditches), craftsmen (copper and bronze workers)