Final answer:
Peasants gave a portion of their crops, labor, and sometimes rent to their knights in exchange for the land they farmed and for protection within the feudal system.
Step-by-step explanation:
In the feudal system peasants provided agricultural labor on the farmland they received from their knights or lords. In exchange for the land they farmed, peasants offered a portion of their crops, labor, and sometimes payments in the form of rent. This arrangement was part of a broader social and economic system known as manorialism, which was closely linked to feudalism and involved a hierarchy of obligations between lords, knights, and peasants. The social structure demanded that peasants work the lands and in return, they received protection and a place to live, bound to the land under the oversight of their feudal superiors.