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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.
A blue zone is considered to be a longevity oasis and the people who live there are believed to have the longest life expectancies on earth. The longest living women were found in Okinawa, Japan. Another blue zone was discovered in the mountains of Sardinia, Italy where even men reach the age of 100 at an amazing rate, another was discovered on the Nicoya Peninsula of Costa Rica in 2007. Only one of the blue zones is located in the United States.