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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.
Watch any tree expert inspecting. the root zone and you will see that look: surmising. what is going on below ground, looking for clues. Some of us have always felt the root system is. the most important part of the treeâthe key to. health and longevity. Yet, roots have always been. difficult to study.