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Passage about pest control methods. What makes biological pest control sustainable?

1. It uses genetically modified crops to resist pest attacks naturally.
2. It involves selective breeding of plants that can withstand insect damage.
3. It relies on natural predators to reduce pest populations without harming the environment.
4. It encourages farmers to manually remove insects instead of using any artificial methods.

Correct answer: It relies on natural predators to reduce pest populations without harming the environment.

Solution

As stated in the passage, biological pest control (using parasitic wasps as natural predators) is sustainable because it reduces pest populations without environmental pollution — unlike chemical pesticides.

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