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(B) Population density $(N)$ changes over time due to four basic processes: $1$. Natality $(B)$: Number of births in a population during a given perio

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Natality and Immigration

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(B) Population density $(N)$ changes over time due to four basic processes: $1$. Natality $(B)$: Number of births in a population during a given period. This increases the population density. $2$. Immigration $(I)$: Number of individuals of the same species that have come into the habitat from elsewhere during a given period. This increases the population density. $3$. Mortality $(D)$: Number of deaths in a population during a given period. This decreases the population density. $4$. Emigration $(E)$: Number of individuals of the population who left the habitat and gone elsewhere during a given period. This decreases the population density. Therefore,Natality and Immigration are the factors that contribute to an increase in population density.

Which of the following factors contribute to an increase in population density?

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