Have you ever heard of the fallacy of composition?
So which is it - structure, or function?
I guess you don't know what isomorphism is. Look it up then you'll understand the relationship of structure and function in this context.
when fire oxidizes fuel to produce energy, it's similar to when cells use the citric acid cycle to oxidize fuel
True, there is some similarity, but isn't it the case that ordinary combustion is a far simpler process than the citric acid cycle? One obvious dissimilarity is that the latter involves a cycle and the former does not. And aren't there some ten steps in the cycle while combustion is one step that reacts a heated fuel and oxygen?
I'm only working with what you've given me thus far. You said structure was what matters. So, let's look at the structure of what you eat and see if it's really less "complex" than you are. I'm betting you don't content yourself with protein gruel, and hence, it isn't. Of course, your steak is (we hope) no longer "alive" - it's function is now to be food for something else. Someday you and I will be functionally equivalent to the steak, in that respect ;)
I guess you don't know what isomorphism is. Look it up then you'll understand the relationship of structure and function in this context.
I'm familiar with it, in both the biological and mathematical senses. You said structure matters, so 100,000,000 identical transistors didn't form a complex, living whole - but then, neither do 100,000,000 million structurally identical people. Then you said function matters, so I pointed out that the Krebs cycle and a burning log were functionally equivalent. Now you appear to be saying that if we define something as alive, and find something both structurally and functionally similar, we can call that alive as well. But you said that people aren't functionally the same, or functionally similar enough, anyway - so even though I am alive, and you appear to be structurally similar, I can't say that you're alive by this process you seem to be developing.
Look, I'm not really pursuing all this as a serious argument - I'm merely suggesting that this whole "alive" versus "not alive" thing is a bit more complex than it might appear to be at first blush...
True, there is some similarity, but isn't it the case that ordinary combustion is a far simpler process than the citric acid cycle? One obvious dissimilarity is that the latter involves a cycle and the former does not. And aren't there some ten steps in the cycle while combustion is one step that reacts a heated fuel and oxygen?
Agreed. But then we have to ask ourselves, what is this magic level of complexity, above which something is "alive", and below which, it is not? How complex is complex enough to be alive?