What is a common benefit of writing and the wheel?
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a. both made trade easier.
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b. both were necessary for architecture.
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c. both made mathematics possible.
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d. both allowed for city planning.
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A. Both made trade easier.

Explanation:

The wheel made it possible to transport more items and carry them for longer distances a lot easier than before. This meant that transportation and communication were easier and much more efficient.

Besides writing down history and poems, writing also helped merchants to memorize and keep track of trade. The combination of these two shaped Human history and they still shape our lives today.