Ever heard the term "carbon based"?
I don't directly correlate transfer efficiency to carbon content, but all things in nature can be dated by their carbon content. All things currently known to be in existence (that I'm aware of) are carbon based.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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