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Increment borer - used to extract core sample, Source: www.wikipedia.orgThe age of the living trees is found, with the help of an instrument called an 'increment borer' with relatively minor injury to the tree.

It is a type of drill that is inserted into the trunk of the tree at its widest girth and to extract a section of wood tissue from a living tree.

Thus we can obtain a linear core of wood which can be considered as the number of annual growth rings.

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u can count the approximate age of a tree by counting the number of annual rings.......
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Dendrochronology can help.