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Organic evolution, or change, among the diatoms has proceeded with considerable regularity. The origins, the extinctions, and the increases in numbers of species and genera, on the whole, have submitted to law and order, as rules-within-limits (rectilinear regression lines within grouped small...
Recent definitions of the botanical terms ecotype, ecospecies and coenospecies are briefly reviewed. Examples of ecospecies are discussed and the following new definitions are proposed:
L'écologie cherche à connaître les conditions d'existence des organismes par rapport à leur milieu physique et biotique.
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