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If a population is decreasing, it could likely be due to

User Yrazlik
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Ans: The decline in U.S. population growth is likely due to a confluence of factors: lower levels of immigration, population aging, and declining fertility rates. A drop in net immigration to the United States is a key factor in the country's declining population growth rate.
User Gacek
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Lack of resources, over predation, influence of a new species
User Wilk
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