Respuesta :
It's "It prevents the two populations from interbreeding" I just took the test.
Geographic isolation is necessary for speciation as it prevents the two populations from interbreeding.
What is speciation?
Speciation is a process in evolution where new species are formed from pre-existing species of an organism.
Speciation can occur due to geographic isolation between two organisms of the same species.
Due to geographic isolation, the organisms are unable to interbreed and with time changes occur in the genes of the isolated organism resulting in speciation.
Therefore, geographic isolation cause speciation as it prevents the two populations from interbreeding.
Learn more about speciation at: https://brainly.com/question/2113835