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Asa Gray - Many years ago it was taught that plants...
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)

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

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carbon chemical different four hydrogen nitrogen oxygen substance teach three years elements

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