Why did peasants agree to farm the land that other people owned?
a. because it was the only way their sons could become knights
b. because they could live in the noble's castle in return
c. because they would be protected from enemies in return
d. because they could keep all the food that they grew

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.