Question

apart from buying and selling what did people do?

Answer 1

People are selling everything: stuff they don't want, stuff they would normally throw away. You can almost anything you need ( and plenty of stuff you don't) on these online auctions sites.

Answer 2

Producers, Consumers, and Decomposers in the Forest Community. Producers are any kind of green plant. Green plants make their food by taking sunlight and using the energy to make sugar. The plant uses this sugar, also called glucose to make many things, such as wood, leaves, roots, and bark.

This is the only thing I can think of.