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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.
The Goldilocks Zone is bigger than we thought. To find out how big, researchers are going deeper, climbing higher, and looking in the nooks and crannies of our own planet. Searching for life in the Universe is one of NASA's most important research activities. Finding extreme life here on Earth tells us what kind of conditions might suit life out there..