What is population density? the total number of people living in a certain area the average number of people in a given area the rate at which the world’s population is expected to grow the cultural or ethnic breakdown of people living in a country?

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.