Which of the timelines above represents the changes that have taken place in communications technology?
a.
timeline a
b.
timeline b
c.
timeline c
d.
timeline d

How do hearths affect cultural diffusion? a. a hearth is the destination of cultural diffusion. b. a hearth divides a cultural region in two. c. a hearth is the beginning point of cultural diffusion. d. a hearth is the means of cultural diffusion. e. a hearth is the meeting point of two diffuse cultures.