What could most likely have caused peasants on midievil manors die so young?

Peasants in Medieval times had tough living conditions and a hard life from the start. They worked relentlessly, and they received little to no food and so lacked sustenance to provide for them. They were also (partly because of the above reasons) very vulnerable to diseases and plagues.

Medieval medicine was also faulty and not available to peasants most of the time.

(If ur looking for a simple answer, just use that they worked hard, had a poor diet, and were vulnerable to diseases).

:)

zheng he was a chinese explorer who lead seven great voyages on behalf of the chinese emperor. his seven total voyages were diplomatic, military, and trading ventures, and lasted from 1405 – 1433. however, most historians agree their main purpose was to promote the glory of ming dynasty china.

explanation:

c, because the american revolution was from 1765 to 1783.