The following responses correctly reflect how the shift to farming affected Native American cultures:
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Farming encouraged native cultures to build more permanent shelters and communities.
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Agriculture provided a surplus of food, allowing for an increase in the population.
The other options are less accurate in terms of the general impact of farming on Native American cultures. The statement about farming leading to a boost in immunity from diseases is not directly linked, and while farms did take up space and could impact community structure, it is not a commonly recognized effect that civilizations withered away due to this.