How can trade define a civilization? I need this for a mastery grade paragraph assignment :,)

I'm just a little confused, please help

Trading is a vital concept in the Civilization series, and it means the exchange of goods and services among the population. It is usually conducted by private entities, known as merchants, which occupy themselves with transporting goods from place to place, buying them in one and selling them in another. This way they help distribute goods from places they're being produced to places that need them, which is a vital part of the world economy.

wetland functions are defined as a process or series of processes that take place within a wetland. these include the storage of water, transformation of nutrients, growth of living matter, and diversity of wetland plants, and they have value for the wetland itself, for surrounding ecosystems, and for people.

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