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All Life on Earth Comes From One Single Ancestor. And It's So Much Older Than We Thought.
(www.popularmechanics.com)
this post was submitted on 15 Jul 2024
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No, since everything we know about the LUCA is from its descendants. Microorganisms without descendants wouldn’t leave behind any evidence of their existence.
Using genetics alone, sure. But maybe there’s fossil or geochemical evidence of early organisms not belonging to any of the three surviving domains—or maybe we could estimate it just from statistics.
Maybe but I don’t think fossil evidence has enough information to confirm something isn’t from the main branch of the tree of life.
especially when some of that stuff took a while for us to realize it's even part of the same organism, or an organism at all.