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Which of the following best explains why the population in some regions north of the Huang River stayed constant over this time period?
Only a few new groups migrated into or out of the region so this allowed the population to stay constant.
Tang and Song farmers produced rich soil quality, which resulted in a population boom in some regions.
The number of invaders who settled in those regions about equaled the number of Song who fled.
The gains in population from an increased food supply about equaled the losses from constant warfare.

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marvineetesh3

The population is stayed constant in the north of Huang River because Only a few new groups migrated into or out of the region. Option A is correct.

What is Huang River?

Huang River is also known as Yellow River. It is the second-largest river of China, after the Yangtze River, and it is the sixth-longest river of the world with the predictable length of  5,464 km.

The north part of the river stayed constant in relation to the another part of the river, be only a fewer new group from the aggregate population migrated into or out of the region.

Therefore, option A is correct.

Learn more about the Huang river, refer to:

https://brainly.com/question/1940028

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