Shelfords law of tolerance

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Shelford's law of tolerance A law proposed in 1911 by V. E.Shelford, stating that the presence and success of an organism depend upon the extent to which a complex of conditions is satisfied (e.g. the climatic, topographic, and biological requirements of plants and animals). The absence or failure of an organism can be controlled by the qualitative or quantitative deficiency or excess of any one of several factors which may approach the limits of tolerance for that organism.