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B

Explanation:

Red and Green

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People was able to barter goods.

Explanation:

The main effect of increasing wealth in ancient civilizations was the development of barter as the first commercial manifestation in history. Thus, when the ancient civilizations began to have surpluses in their production, a system began to develop through which these surpluses were exchanged with other civilizations, which in turn delivered their production surpluses.

For example, if an ancient civilization produced grains, it exchanged its surplus with another civilization that produced meat, supplying each other and generating commercial ties through barter.