A. Cash crops such as tobacco and sugar required many workers.
Mainly through better advancement in technology and our understanding of engineering. What with us going from living in caves to making wooden homes to now living in steel and concrete.
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Explanation:Because I did the same test 5 minutes ago
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Answer:
Writing systems were developed to record food surplus and supply.
Explanation:
Ok so these big agrarian civilizations needed to organize, and they came up with writing so they could keep track of just about everything.