Answer:
. clergy, noble, serf - classes of medieval society (these were the classes which existed during the Medieval times)
2. sparked interest in the Far East from his travels - Marco Polo (he was among the first people to reach China and other parts of Asia)
3. inventor of the printing press - Johann Gutenberg (thanks to him, we have printed books today)
4. class of merchants and businesspeople during the Crusades - bourgeoisie
Step-by-step explanation: