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I've not yet seen an explanation of what counts as a single "organism" for these purposes and the estimated ages are all over the place.

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My guess at a definition: All parts connected, having the same DNA, and supporting each other by sharing nutrients.

This is true of corals, and they are often considered "colonial" organisms instead of an individual.

That said, I don't think anyone who studies biology is particularly concerned with hard-line definitions, as nature tends to eschew them every chance it has.

I think Pando and corals being considered "modular bodyplans/habits" is perhaps a more useful concept than individual or clone.

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