In the manorial system serfs- A) had a series of legal rights over their streets

B) supported the economic system by providing labor on the lord's land

C) developed trade guilds to control the quality or products

D) formed the backbone of European aristocracy

Which statements describe einsatzgruppen? check all that apply. they were considered the last step in the "final solution." they were part of the german army. they carried out mass executions. they were known as mobilized killing units. they were used by germany during the invasions of poland and the soviet union.