Answer:
This innovation greatly increased crop yields simply by inserting the seeds into the ground. ... Both of these major innovations helped in overall agricultural productivity.
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The correct answer is Timbuktu. It became the greatest city because it was a melting pot for traders from all possible nations because it was wealthy and developed compared to other places. It was a cultural and a trading center because the ruler knew how to rule properly and made Timbuktu one of the greatest cities in the world.
