• Many years ago it was taught that plants and animals were composed of different materials: plants, of a chemical substance of three elements,- carbon, hydrogen, and oxygen; animals of one of four elements, nitrogen being added to the other three.

  Asa Gray
  American botanist
  

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Subjects in these quotes:

1. different
2. materials
3. substance
4. elements
5. hydrogen
6. nitrogen

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Many years ago it was taught that plants and animals were composed of different materials: plants, of a chemical substance of three elements,- carbon, hydrogen, and oxygen; animals of one of four elements, nitrogen being added to the other three. by : Asa Gray

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