Consider the following.
Assertion (A): The size of a population for any species is not a static parameter.
Reason (R): The density of population in a given habitat during a given period fluctuates due to changes in four basic processes.
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Population size changes because of
\[
\boxed{
\text{Natality} + \text{Immigration}
-
\text{Mortality}
-
\text{Emigration}
}
\]
Hence, population size is always dynamic.