The were underground passageways where the christians buried their dead and held religious services.

catacombs
campaniles
piers
pendentives

when in doubt choose c

it's what my teacher told my class when we were going into psats

utilized the penal colony

the foundation of greek city-states: following the fall of the mycenaean civilization in the 10th century bc, the area surrounding the empire went through its own mini dark ages. answer and explanation