The simplest model of population growth for species with continuous generations assumes that birth and immigration are combined and death and emigration are combined into a general addition and loss rate, respectively. These rates are constants and the model is represented as dN , — = bN -di dN
where b is the instantaneous birth-immigration rate, d is the instantaneous mortality-emigration rate, N is the population size, and dN/dt represents the rate of change in N.
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