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      Question

      Why is polyethylene (plastic) sheeting used over beds

      during the winter?
      A To increase the flow of fresh air Correct Answer Incorrect Answer
      B To kill off all pests and diseases Correct Answer Incorrect Answer
      C To prevent rapid changes in temperature Correct Answer Incorrect Answer
      D To maximize the levels of oxygen Correct Answer Incorrect Answer

      Solution

      The plastic acts like a mini-greenhouse, trapping the earth's heat. This protects sensitive plants from the "freeze-thaw" cycle that can kill their roots.

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