• The best opinion now is, that there are multitudinous forms which are not sufficiently differentiated to be distinctively either plant or animal, while, as respects ordinary plants and animals, the difficulty of laying down a definition has become far greater than ever before.

  Asa Gray
  American botanist
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Subjects in these quotes:

1. differentiated
2. distinctively
3. difficulty
4. definition
5. animals
6. greater

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The best opinion now is, that there are multitudinous forms which are not sufficiently differentiated to be distinctively either plant or animal, while, as respects ordinary plants and animals, the difficulty of laying down a definition has become far greater than ever before. by : Asa Gray

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