It occurred to me that the greatest question is why does life want to keep living? Why? Ultimate question.
Life forms which do not act in the interests of their own survival and reproduction do not survive and reproduce as efficiently as those which do.
It is the "ultimate" question in the sense that the normative principle of individual survival is what we derive many of our more visible normative claims from. There are other normative principles we might adopt, however, and that can exist in tension with this, such as group or species survival, individual prosperity, group prosperity, individual agency, to name a few. One example would be when a soldier accepts their own death or risk of death to promote the interests of the nation they are fighting for.