How did the Bubonic Plague affect the lives of serfs in Medieval Europe?

It has been argued that the Black Death brought about the end of feudalism. This was the system of service in return for a grant of land, burdening the peasant with many obligations to his lord. ... Lords and peasants alike were indicted for taking higher wages. In 1363 a Sumptuary Law was brought through parliament.

the Bubonic Plaque is also known as the black death

i believe your answer is mountains.

answer; ///attempts to change more than once behavior at the same time;