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Originally Posted by warlock667
The last part I get, but the first line still doesn't make sense to me. Oh well 
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Trees are essentially dying until they reach maturity. At which point, they don't grow any taller but may still "live" after reaching maturity. Trees, unlike humans, have generating, not regenerating systems. Once a cell on a tree dies, its parts and the cell itself remain dead. However, new cells and cell parts (leaves or needles) can still grow (live) but will be in a different spatial position.
I hope this helps.