Alack of sewage structures in overcrowded cities may lead to a. a higher currying capacity b. larger urban heat islands c. poor public health d. a greater support capacity

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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during the middle ages bibles and most christian literature was written in latin i think that’s the answer you are looking for