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The zone that would be most difficult for a plant to live in is the  Benthic zone. It is the zone at the lowest level of a body of  water.
To live in most ecosystems, then, organisms must be able to survive a range of conditions, called the range of tolerance.. Outside that are the zones of physiological stress, where the survival and reproduction are possible but not optimal.ince emerging, life has evolved into a variety of forms, which have been classified into a hierarchy of taxa. Life can survive and thrive in a wide range of conditions. Nonetheless, more than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct.