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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.
Blue Zone. Blue Zones is an anthropological concept that describes the characteristic lifestyles and the environments of the world's longest-lived people. The term first appeared as an international concept in the November 2005 National Geographic Magazine cover story The Secrets of a Long Life by Dan Buettner.