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zero population growthpopulation explosionenvironmental resistancebaby boomfertility ratebirth ratepopulationminimum viable populationepidemiologic transitionpopulation pyramidspecies abundancepopulation densityvital ratesage distributiondensity-dependent factordensity-independent factormortality
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Key People

Thomas Malthus
English economist and demographer

Kingsley Davis
American sociologist

Paul R. Ehrlich
American biologist and educator

Jacques Bertillon
French statistician