The nomadic mongol people traded wool for the wood they needed to make frames for shelter. this is an example of what system?

   Barter system

Explanation:  Barter is a system of trade in which goods are exchanged directly for other goods, so there is no use of any medium of exchange such as money and other securities etc. It is one of the oldest methods of trade where services could be exchanged in addition to goods. Of course, in the barter system, the participants negotiated the exchange of the amount of goods that would be exchanged, so the price.

social act if im thinking of the right thing

explanation:

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world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

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