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The rise of new species is also known as speciation.

Geographical Barrier :  It is related to the barrier which is made in our the nature its exrinsic in nature  means any mountain or river which not allows gene flow .This leads reproductive isolation and hence they behave as 2 diffrent species now.
Natural Selection :
Darwin and wallace suggested that new species arise from pre-existing species and hence it is related with
 "Survival of the Fittest "

Genetic drift : It means drastic change in the frequencies of population by chance may lead o rise of new species .

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