What 3 features formed the central northern boundary of the roman empire?

Which four of these developments were made under mongol rule during the pax mongolica? the extension of the grand canal in china the spread of christianity the spread of weapons that used gun powder the invention of new medicines the establishment of a postal system the invention of geometric models of lunar motion

The original term of was descriptive of lower-class people who performed manual labor.

What was a common theme of folk and rock music created by the 1960s counterculture? a. nonviolence b. hate c. self-denial d. aggression