The formation of new species from populations that are not isolated from each other is called

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Sympatric speciation occurs when the formation of new species happens within the same geographic region without a physical barrier. It typically occurs when a single population becomes reproductively isolated from the rest of its species due to factors such as polyploidy, hybridization, or disruptive selection. Convergent evolution and gene flow do not lead to the formation of new species, while allopatric and parapatric speciation involve some form of geographic isolation.

The Formation of New Species from Populations That Are Not