ABSTRACT
Since 1992, scientific knowledge has been enough to determine the origin of life: “life originated through RNA”. The truth is that current life world on Earth is just an RNA world, since the protein is created by RNA, then DNA as life’s database is created by RNA along with reverse transcriptase (a protein of RNA making). The two life series on the planet originated through two RNA groups (named ΣRNA ): IΣRNA and IIΣRNA . IΣRNA consists of the RNA members of the translational machinery (i.e., three kinds of rRNAs, 20 kinds of tRNAs, several ribozymes etc.) and the mRNA encoding an RNA replicase. IΣRNA is able to produce the RNA replicase and then with this replicase IΣRNA can also produce own template IΣRNA？. Thus its two tools (own template IΣRNA and producing-force RNA replicase) arise. Two tools can in turn produce the template’s prototype, namely IΣRNA . So the prototype and its tools can produce each other, and the “egg-chicken” replication loop is formed. From this time, the life arises. IIΣRNA consists of the RNA mem-bers of the translational machinery and mRNA encoding reverse transcriptase and transcriptase. This group is able to produce reverse transcriptase and transcriptase. Thus, two tools (template IIΣDNA and producing-force tran-scriptase) can also arise, which can reproduce IIΣRNA (the prototype of the template). Here, the prototype and its tools can also produce each other, and the “egg-chicken” replication loop is similarly formed. Thus, life is also creat-ed. RNA viruses that do not involve DNA in their lifecycle belong to the IΣRNA life series. All life on Earth, excluding the above viruses, belong to the life series that originated from IIΣRNA .