About $98\%$ of living organisms are composed of elements including carbon,hydrogen,nitrogen,oxygen,and:

  • A
    Sulfur and magnesium
  • B
    Magnesium and scandium
  • C
    Phosphorus and sulfur
  • D
    Calcium and phosphorus

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Which of the following represents the correct order of elements based on their abundance in living organisms?

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Which four elements make up $99\%$ of the living system?

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