The zone of intolerance is the location outside the geographical range with the absence of population. This region is being represented by the extremes of the limiting factor where organisms does not have the ability to survive.
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The optimal zone refers to the physical factors where individual survive. Physiological stress zone refers to the location in the geographical range of the population with rare numbers of population because of the presence of physical and biological limiting factors.
Answer - Option C. Zone of intolerance
