Explain four basic processes which affect the population density.

The density of a population in a given habitat during a given period, fluctuates due to changes in four basic processes, two of which (natality and immigration) contribute to an increase in population density and two (mortality and emigration) to a decrease.

(i) Natality refers to the number of births during a given period in the population that _______ ___ _________ _______ _________ _______ ________ __________.
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