8. Dallas, Texas is a large metropolitan city in the United States. Which of the following technological advancements contributed the most to this growth? * a. air conditioning
b. computer technology
c. traffic congestion
d. mass media

Acivilization exists for several hundred yeaars, developing its own language. such a civilization probably has been: a. farming corn b. suffering from a lack of contact with the outside world. c. isolated by mountains or some other physical barriers. d. starving from lack of trade.