Does anyone know the definition of feudalism and are the social classes, kings, nobles, knights, and peasants.

Fuudalism is a social system existing in medieval Europe in which people worked and fought for nobles who gave them protection and land in return. The main social classes of feudalism included kings or monarchs, nobles, knights, and peasants.

hope this helps :)

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)