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>This theory would explain why LUCA [0] is so complex and why life appears almost as soon the Earth had liquid water [1].

from the wikipedia article:

>LUCA should not be assumed to be the first living organism on Earth




On the other hand it should not be assume that it is not. The complexity of LUCA is a problem since LUCA is not much less complex than a modern bacteria which is very, very complex.




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