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Population is a group of organisms usually of the same species, occupying a defined area during a specific time.
Population growth rate is the percentage variation between the number of individuals in a population at two different times. Therefore the population growth rate can be positive or negative.
The main factors that make population increase are birth and immigration. The main factors that make population decrease are death and emigration.
The main limiting factors for the growth of a population are abiotic and biotic components.
Population density is the relation between the number of individuals of a population and the area they occupy.