| 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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