Ais an economic system that does not use money for trade.
a. bill of exchange
c. domestic system
b. barter economy
d. market economy
frederick barbarossa drowned during the
a. first crusade
c. third crusade
b. second crusade
d. he did not drown

First item's answer is letter B. A barter economy is an economy system that does not use money for trade but rather uses goods or services exchanged. Second item's answer is C. Frederick Barbarossa was drown during the Third Cruisade in Goksu River.

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Sector is best defined as (part).