If the Proto-Indo-European-Euskarian Hypothesis receives further confirmation, a range of long-standing questions within Indo-European historical linguistics may be illuminated by taking Proto-Basque reconstructions into account. The most widely accepted hypothesis regarding the Proto-Indo- European oral stop inventory is a problematic one. Proto-Indo-European roots often appear with what are called 'extensions', mono- or bi-segmental additions to roots that are added "without any discernible change to the meaning of the root". There are many hypotheses about the homeland of the people who spoke the Proto-Indo-European language, and about the antiquity of this language family. Proto-Indo-European is based primarily on linguistic reconstruction combined with archaelogical findings relating to material culture and technology. While archeological findings support ancient agriculture in the Basque Country, it appears that Proto-Basque also split from Proto-Indo-European before the plough was introduced in farming. The plausibility of Proto-Basque as a distant relative of Proto-Indo- European may also have some genetic support.