If there's only one of a lifeform and it is immortal, can variation and natural selection still operate somehow? 
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Didn't know of Ship of Theseus but heard of concept via Stanislaw Lem's "Do You Exist, Mr. Jones?" https://en.wikipedia.org/wiki/Przek%C5%82adaniec …
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I first heard of Gaia in my teens from Peter Russell 1982 book, The Awakening Earth
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Vaguely filed away as new agey/spiritual. Didn't know so much of scientific study has been on
End of conversation
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