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A country's fertility rate suggests zero population growth, but it shows an increase of 20—30 percent over 50 years. what might account for this? a larger proportion of post-reproductive females lower logistic growth higher environmental resistance immigration better food availability

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GeoPanther
The correct answer is - immigration.
Even though the fertility rate suggests zero population growth, the population can gradually grow with immigration. Perfect example of this are the USA and Canada. Even though the fertility rates are low, the population is gradually growing because of the immigration that's taking place, and people from all around the world come to live in this countries. 

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