*also called the last universal ancestor (LUA)*
*aka ‘concestor’*
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*the last universal common ancestor (LUCA) is the most recent population of ‘organisms’ from which all ‘organisms’ now living on ‘earth’ have a ‘common descent’*
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*the most recent ‘common ancestor’ of all current ‘life’ on ‘earth’)
(like the unknown divine ‘prime mover’ in the ‘physical sense’)
(here was have the ‘prime mover’ of ‘life itself’)
(a related concept is that of progenote)
*BUT NOT QUITE…*
(‘LUCA’ is NOT thought to be the first life on ‘earth but only 1 of many early organisms, all the others becoming ‘extinct’)
(while there is no specific fossil evidence of LUCA, it can be studied by comparing the ‘genomes’ of all modern organisms (its ‘descendants’))
(by this means, a ‘2016 study’ identified a set of ‘355 genes’ most likely to have been present in ‘LUCA’)
(however, some of those ‘genes’ could have developed later, then spread universally by ‘horizontal gene transfer’ between ‘archaea’ + ‘bacteria’)
(the genes describe a ‘complex life form’ with many ‘co-adapted features’, including ‘transcription / translation’ mechanisms to convert ‘information’ from ‘DNA’ –> ‘RNA’ –> ‘proteins’)
(the study concluded that the LUCA probably lived in the ‘high-temperature water’ of ‘deep sea vents’ near ‘ocean-floor magma flows’)
(studies from ‘2000’ – ‘2018’ have suggested an increasingly ancient time for ‘LUCA’)
(in ‘2000’, estimations suggested LUCA existed ‘3.5 billion’ – ‘3.8 billion’ years ago in the ‘paleo-archean era’, a (mere) hundred million years after the earliest ‘fossil evidence’ of ‘life’, for which there are several candidates ranging in age from ‘3.48 billion’ to ‘4.28 billion’ years ago)
(s ‘2018 study’ from the ‘university of bristol’, applying a ‘molecular clock model’, places the ‘LUCA’ shortly after ‘4.5 billion years ago’, within the ‘hadean’)
(‘charles darwin’ first proposed the theory of ‘universal common descent’ through an ‘evolutionary process’ in his book on the origin of species in ‘1859’)
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“therefore i should infer from analogy that probably all the ‘organic beings’ which have ever lived on this earth have descended from some 1 ‘primordial form’, into which life was first breathed”
charles darwin
(1859)
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(later biologists have separated the problem of the ‘origin of life’ from that of the ‘LUCA’)
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👈👈👈☜*’HISTORY’ OF ‘LIFE’ ON ‘EARTH’* ☞ 👉👉👉
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💕💝💖💓🖤💙🖤💙🖤💙🖤❤️💚💛🧡❣️💞💔💘❣️🧡💛💚❤️🖤💜🖤💙🖤💙🖤💗💖💝💘
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*🌈✨ *TABLE OF CONTENTS* ✨🌷*
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🔥🔥🔥🔥🔥🔥*we won the war* 🔥🔥🔥🔥🔥🔥