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  1. An element that is required by or found in the bodies of living organisms. The list of such elements includes carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur, chlorine, iodine, bromine, calcium, magnesium, potassium, sodium, vanadium, iron, manganese, and copper. All may belong also to the chalcophile or lithophile groups. Hess
  2. Said of those elements that are the most typical in organisms and organic material. AGI
  3. Said of those elements that are concentrated in and by living plants and animals. AGI

Source: Dictionary of Mining, Mineral, and Related Terms

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