Could use some help finding the right word to express this idea

Hi all,

I'm currently typing up my personal statement for a medical school application and I could use a little bit of help. I am unable to think of a word to express an idea I am trying to communicate so I figured what better place to try and find this word than a literature forum!

The portion of the statement I am trying to fill is "life has an intrinsic value, at least some of which, I feel is derived from its _______."

The word I am looking for would express that life is a 1 and done deal, you get 1 shot at it and then there aren't any repeats. Transient and ephemeral are words I've considered but just really aren't expressing quite what I'm looking for. If y'all have any ideas, I'd be really grateful.

Thanks a ton in advance!

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Could use some help finding the right word to express this idea