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Discussion

Ecology, like economics, concerns itself with the movement of valuable ____ through a complex network of producers and consumers.

  • A.commodities
  • B.Dividends
  • C.Communications
  • D.Nutrients

Answer: A

Correct answer: commodities

The sentence rests on the analogy ecology, like economics, so the missing word has to work in both fields. It also has to fit valuable and to be something that moves through a network of producers and consumers.

Commodities does all three: economics moves goods, ecology moves matter and energy through food chains, and both are described in the language of production and consumption. Nutrients is true of ecology alone and so breaks the analogy the sentence is built on; dividends and communications belong to neither network.

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