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MMLU / Which of the following sources makes the greatest contribution to the dry mass…

Problem

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question

Which of the following sources makes the greatest contribution to the dry mass of organic matter that comprises an oak tree?

choices

  1. Organic molecules from decaying matter in the soil that are taken up by the roots
  2. Mineral nutrients dissolved in groundwater that are taken up by the roots
  3. Water that is taken up by the roots and carbon dioxide from the air
  4. Endosperm located in the cotyledons of the acorn

subject

college_biology

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Official source

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