Question

What is different between overpopulation and underpopulation

Answer 1

Over Population means population of a place in a larger number than usually required or normal. i.e. more no. of people per km² of area then usually there should be.
Under Population means population of a place in a lower number than usually required or normal. i.e. less no. of people per km² of area then usually there should be.
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Answer 2

Answer:

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Over-population

 when there are too many people, to be supported to a good standard of living, by the resources of a region or country. 

Under-population

  when a region or country has insufficient workers to exploit their resources efficiently, to support retired populations and to provide growth.