Refer to the map below to answer the following question: What factors explain the major increase in population in half of China and a much smaller change in the other half?

an invasion from the north and rich farmland to the south
an invasion from the south and rich farmland to the north
overland trade and urbanization
seagoing trade and urbanization

a. would be the answer : )

explanation:

norsemen from northern countries had made earlier journeys

it's no easy i swear it's hard

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