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      Question

      To support healthy root growth, a high-quality medium

      must be porous and contain:
      A Large stones Correct Answer Incorrect Answer
      B Organic matter Correct Answer Incorrect Answer
      C Trace heavy metals Correct Answer Incorrect Answer
      D Fine clay particles Correct Answer Incorrect Answer

      Solution

      Organic matter, like compost, provides the nutrients and microbial life necessary for growth. It also helps the soil hold exactly the right amount of water.

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