Answer:
This is the answer of your question.
Earliest human migrations and expansions of archaic and modern humans across continents began two million years ago with the migration out of Africa of Homo erects.
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By the end of ww1 people were using airplanes in combat, they weren’t the best during war but by ww2 they had evolved. It was hard to fly an airplane and shoot at the target especially with regular guns and not a machine gun.
