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.

rain should be the answer.

since learning about his learning patterns, logan has become very aware of the thoughts and feelings he experiences as he listens to the “internal chatter” of his patterns.