According to scientific evidence, the age of the earth is about

● 3.5 billion years old
● 4.6 billion years old
● 7.2 billion years old
● 2.3 billion years old

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.