The number of organisms in a population is ad | vedclass

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(D) Population density changes due to four basic processes: $1$. Natality (Births): The number of births during a given period in the population that

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Both $(A)$ and $(B)$

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(D) Population density changes due to four basic processes: $1$. Natality (Births): The number of births during a given period in the population that are added to initial density. $2$. Immigration: The number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration. $3$. Mortality (Deaths): The number of deaths in the population during a given period. $4$. Emigration: The number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration. Therefore,both Births and Immigration contribute to an increase in the population size.

The number of organisms in a population is added by:

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