I think it's somewhat comparable to say a piano.
Is there really a piano or is it a bunch of strings and wood blocks.
I mean, we can say this about anything basically.
I see a human as a complete life. If we go by the wikipedia definition of life, which includes reproduction, response to stimuli and so forth, we see that we need to include a lot of different things that individually would not be life.
Therefore I think a life is a compound of different functions, like the ones mentioned on wikipedia..
But on a more analytical level, if I cut off my arm, that arm could say to be alive at least for a period, so that brings up some interesting questions like which things define life.
But I don't know exactly what you meant in your original post so won't get into it.