Stones, sharp rocks, wood, & animal bones.
This historian would be using the skill of "comparative analysis," since he or she is comparing a wide variety of sources to draw a conclusion between them as a group.
It could be argued that the "serf" was the "property" of the land during the Middle Ages, since under the feudal system that reigned supreme during this time, serfs (or peasants) had very little rights of their own.
Answer: (quit)
Explanation: i think Europe
