>> Trees are really land coral.
> 
> Basically, yes, this is correct. But trees also grow from their buds, so 
> the overall functionning is more complex. Also, I don't think corals get 
> much nutrients from the soil, and of course they don't have to mine for 
> water either ;-)
> 
> In fact cells in trees are more specialized than individuals from a 
> coral colony. But there are indeed similarities in the principle...

Yeah. Strictly a coral isn't a single organism, while a tree is. But the 
growth mechanism is quite similar.

>> Corollary: Do corals have growth rings?
> 
> Yes they do. Google is your friend too :-)
> http://www.niwa.co.nz/news-and-publications/publications/all/wa/12-4/coral

OMG! I was right about something... o_O

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