Give differences : Immigration and Emigration

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Immigration Emigration
 $(1)$ Inward movement into a local population.  $(1)$ Outward movement from local population.
 $(2)$ Increases population size and so gene pool.  $(2)$ Decreases population size and so gene pool.
 $(3)$ For better condition.  $(3)$ To defend from unfavourable conditions, like scarcity of food. Shelter or mate; natural calamaties like draught, floods etc.

 

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