Answer:
The most appropriate title for the paper could be "speciation through geographical isolation".
Geographical isolation is one of the causes of speciation in which populations of a species are separated by physical or geographical barriers such as a river, mountains, canyon et cetera.
It prevents the exchange of genetic material between the two populations which results in the development of new species over a long period of time.
In her paper, the student also showed that how the two groups adapted differently and can no longer interbreed and thus, results in the formation of new species.