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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.
Although many searches for worlds like our own focus on Sun-like stars, itâs also possible for smaller, cooler red dwarf stars to have a habitable zone â although any planets orbiting close enough would likely be tidally locked, with one hemisphere permanently lit and other always in darkness.