Passage:
Historical linguists analyzing the rapid dispersion of early Austronesian languages across Oceania have traditionally cited advances in double-hulled canoe navigation as the primary catalyst. However, recent archaeobotanical evidence shows that domesticated taro cultivation techniques spread along identical maritime routes decades prior to the widespread adoption of double-hulled canoes. The author concludes that agricultural expansion, rather than naval technology, served as the principal mechanism driving initial Austronesian linguistic diffusion.
Statement: The spread of taro cultivation across Oceania was accompanied by the movement of Austronesian speech communities, rather than being adopted by pre-existing populations without linguistic shift.
Based on the passage, is the statement above a necessary unstated assumption required by the author's argument?
Cevap: Cevap