What was one model of the solar system developed by early astronomers?

What are the secondary main characters in aquaman?

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.

Countries trade with each other because resources are not evenly distributed across the globe. true or false