Species - Interbreed under natural conditions and produce viable, fertile offspring., Geographic isolation - Allopatric speciation involves, Hybrid - An organism that is a cross between two different species, Postzygotic barrier - Hybrid individual does not survive past the embryonic stages, Prezygotic barrier - Temporal isolation, Gene flow - Movement of alleles between populations , Genetic drift - Random changes in allele frequency , Natural selection - Organisms better adapted for an environment are more likely to pass on their traits , Allele - Version of a gene, Population - Groups of organisms of the same species living in the same area at the same time,

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