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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.
Life on Earth will continue for at least another 1.75 billion years ... but human life could die out long before. Astrobiologists predict our planet will move out of the solar system's habitable zone and become too hot for even primitive bacteria. To survive, humans might have to migrate to Mars. The calculations were based on our distance from the sun and temperatures at which it is possible for the planet to retain water.