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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.
Less oxygen dissolved in the water is often referred to as a âdead zoneâ because most marine life either dies, or, if they are mobile such as fish, leave the area. Habitats that would normally be teeming with life become, essentially, biological deserts.