Like the trees that produce them, bristlecone needles are long-lived; they last up to 30 or 40 years. While living bristlecone limbs thus carry a heavy load of needles, such a stable needle mass ...
Assessing the age of a living tree is straightforward enough—just extract a core from the tree's circular trunk and count the number of lines in the core formed by the tree's annual growth rings.
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