Which of the following was a direct result of the development of agriculture? a. populations decreased as the food source was less reliable. b. permanent settlements were developed for the first time. c. societies began to embrace a more nomadic lifestyle. d. diseases spread as people started to trade with one another.

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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