I must assume you are asking “Why is there life?”
Science cannot answer that question. Read the Bible to find that answer.
But AMD, that is precisely the question I'm not asking here!
Two reasons I'm not asking it: (1) I am trying to stay within the confines of science; but this "WHY?" question points straight to God (IMHO there is no other conceivable alternative cause that can stand rigorous logical test). Science cannot ask a question like that and still be science. (2) I already know the answer (see immediately above); but my knowledge of same isn't relevant to "doing science." And so I do not let it intrude (or try very hard not to) into scientific investigation. Which is premised on the empirical. (I.e., you have to show direct evidence in support of claims.)
On the other hand, the "WHAT" of life is what comes into the range of human direct perception, as aided by human intellect. Thus, the WHAT question belongs to science. The WHY question belongs to God.
What I want to work on here is the WHAT question. Can I make my intent any clearer?
I am only asking: "What is Life?" That is, what are the essential things we need to understand in order to come up with a valid, comprehensive "physical description" of WHAT life is. One in which formal theory maximally "maps" to phenomenal (physical+) biological Reality.
I deeply believe that this is a "conversation" that science — biological and physical — needs to be having right about now. FWIW JMHO
Oh, and by no means ought we neglect to invite the mathematicians to the party! Mathematical modeling may well hold the keys to the future development of a "realistic" biology.