Differentiate between Immigration and Emigration.

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Immigration Emigration
$(1)$ Inward movement of individuals into a local population. $(1)$ Outward movement of individuals from a local population.
$(2)$ Increases the population density and the size of the gene pool. $(2)$ Decreases the population density and the size of the gene pool.
$(3)$ Often occurs in search of better living conditions or resources. $(3)$ Often occurs to escape unfavourable conditions,such as scarcity of food,shelter,mates,or natural calamities like droughts and floods.

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