The correct phrase is: Feudalism gave everyone a chance to contribute to the community and survive. Feudalism protected serfs from barbarians because they were under the protection of their vassals who secured them in return of them working the land. They were also protected from famine, because they were able to eat a bit of the land they produced.
it is asking to explain one way that scholarly disciples not recorded in history have contributed the perspectives explained by Diamond. (who im presuming is the author)
