Every child knows that you can tell the age of a tree by counting its rings. For scientists studying a 374-million year old tree, that posed a problem — and not because it's really easy to lose track of your count when you pass 20 million or so. The trunk of this tree didn't have any rings at all, and that completely changes our understanding of how trees evolved.
Why Do Trees Have Rings?
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Written by Ashley Hamer December 27, 2017
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