Answer:
Ethnic groups share a common <u>characteristic</u> while religious groups share a common <u>belief</u>.
Paper and printing. Also the compass was a development from the Tang Dynasty as well
<span>India and Burma hope this help
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With urban planning, we were able to plan how water systems should work, how to stop diseases from spreading, and how to get rid of garbage. This had a deep, positive impact on cities.
