The only reason time exists is so everything doesn't happen at once.
Life is what it is.
That's an example of a tautology. Tautologies usually aren't well regarded as a means of explanation. The truth they convey is considered trivial. Nevertheless, there is something of a deeper truth conveyed in some of them as well. I suppose many things have been written that purport to explain life, but my sense is they all fall short of the mark.