Clergy, noble, serf johann gutenberg 2. sparked interest in the far east from his travels marco polo 3. inventor of the printing press bourgeoisie 4. class of merchants and businesspeople during the crusades classes of medieval society

1. 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 

Andean mountains amazon basinatacama desert brazilian highlands