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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.
If there is too little of any given plant or animal then those that depend on it for food may have a hard time surviving. The circle of life that is part of any biome is very complex. What affects one living thing within it will affect all of them on some level. That is why it is so important to learn about biomes.