I find this notion to be completely ridiculous. There's some things that are common to all life. The genetic code for instance. There are of course different di

I find this notion to be completely ridiculous. There's some things that are common to all life. The genetic code for instance. There are of course different dialects [1], but they're all fairly similar, and all code for the same set of amino acids. Cephalopods use the same means of storing genetic information, DNA with the bases G, C, A, and T. They have the same machinery to translate the genetic code into proteins, ribosomes. Ribosomal structure is highly conserved among all life. The idea that all of these molecular machinery developed in parallel on a different planet with the exact same genetic code, means of storing genetic information, and means of converting genetic information in protein is beyond absurd. [1] https://www.ncbi.nlm.nih.gov/Taxonomy/Utils/wprintgc.cgi https://www.ncbi.nlm.nih.gov/Taxonomy/Utils/wprintgc.cgi