How to study good introduction psychology?

In exchange for land, a knight agrees to be a sort of sub-vassal to a vassal. this agreement was known as: investiture homage tyranny subinfeudation

What best describes how producers benefit from specialization

Which of the following contributed to the cultural rebirth known as renaissance a. the development of the feudal order b. an emphasis on church teachings c. the growth of trade and commerce d. the rejection of the teachings of ancient greece and rome