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It wasn’t until spring that we knew for certain the tree was dead.
Secondary growth emerges from a ring of specialized cells that encircle the stem.
(That tree was almost 500 years old when the first pyramids were built in Egypt.) Scientists speculate that the hardy bristlecones owe their endurance largely to location: They avoid fires that sweep through lower elevations and pests that can’t stomach the harsh terrain of the subalpine zone.