Which of the following was not a purpose of singing towers? to send a warning alarm in time of danger
monks would preach from the tower
bells rang to announce good news
the peal of the bells called the people together

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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.

hope this .

plz give me brainliest!