Describe in your own words the story of the four children of Nut and Geb and what terrible events happened between them, Make sure to include all the important details.

One drawback of voluntary trade is that it a.requires two groups to use a common language b.can make one group dependent upon another for necessary goods c.doesn't occur unless there is a shortage of goods for at least one group d.forces groups to rely on themselves to produce all the goods they need