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The range of tolerance refers to the limits within which an organism can survive, grow, and reproduce in response to a particular environmental factor. In plant ecology, it explains how different species respond to variations in factors such as temperature, light, moisture, salinity, soil pH, and nutrients. This concept was clearly expressed by Shelford in his Law of Tolerance, which states that for each environmental factor there is a minimum, optimum, and maximum limit beyond which the organism cannot survive. For any given ecological factor, plants show a gradual response rather than an abrupt one. At the lower extreme lies the minimum limit, _______ __________ _____ _____ ____ _________ ______ _____ _____ _______ ____.
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