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Common descent
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===Other similarities=== Biologists often{{quantify|date=March 2018}} point to the universality of many aspects of cellular life as supportive evidence to the more compelling evidence listed above. These similarities include the energy carrier [[adenosine triphosphate]] (ATP), and the fact that all amino acids found in proteins are [[Chirality (chemistry)#In biochemistry|left-handed]]. It is, however, possible that these similarities resulted because of the [[Laws of science|laws of physics and chemistry]] - rather than through universal common descent - and therefore resulted in convergent evolution. In contrast, there is evidence for homology of the central subunits of [[ATPase#Transmembrane ATP synthases|transmembrane ATPases]] throughout all living organisms, especially how the rotating elements are bound to the membrane. This supports the assumption of a LUCA as a cellular organism, although primordial membranes may have been semipermeable and evolved later to the membranes of modern bacteria, and on a second path to those of modern archaea also.<ref> {{cite book |last= Lane |first= Nick |author-link= Nick Lane |year= 2015 |title= The Vital Question: Why Is Life The Way It Is? |publisher= Profile Books |isbn= 978-1781250365 |title-link= The Vital Question |page= <!--part 77 of online edition--> }} </ref>
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