Final answer:
Zones of intolerance are areas in a population's range of tolerance where survival is impossible due to extreme conditions.
Explanation:
Zones of intolerance refer to areas within a population's range of tolerance where survival of that species is impossible due to extreme abiotic conditions. For example, if a freshwater fish species has a narrow tolerance range for dissolved oxygen and the water becomes eutrophic, leading to low oxygen levels, the species will not survive. This concept highlights the critical boundaries within which species can exist.
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