The evidence that one species of finch migrated to a Galàpagos island,and evolved into two species now found on the same island,feeding on different food sources,is an example of ____ speciation.

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The scenario described is an example of sympatric speciation, as the two species formed on the same island from a common ancestor and occupy the same geographic area but have different ecological niches (different food sources). Allopatric speciation occurs when populations are geographically isolated from each other, while parapatric speciation occurs when there is limited gene flow between adjacent populations. Prezygotic and postzygotic barriers are mechanisms that can prevent interbreeding between different species, but they do not necessarily result in speciation.

The Evidence That One Species of Finch Migrated to a Galàpagos