Answer and explanation

Correct answer: B. Growing one crop species over a large area

  1. Step 1: Mono means one.
  2. Step 2: A single species is grown, which can lead to rapid spread of disease.
Answer
Growing one crop species over a large area.
Why not the others: Growing a mix of species together in one field: this is a polyculture. An area where no plants are able to grow: a monoculture has plants. A farm that keeps only animals: this is not a crop.

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