if you show me a rock, then it is alive. No test is needed.
I don't agree with myself on this argument either. I don't think rock is alive. It is simply a test to people who does not know what a life really is. The real issue is: I don't think plant is a life. If people argued that plant is a life, then I will respond by saying that rock is also s life based on the same reasons.
Ultimately, we do not have a good scientific definition of life.
Rather, we have several, and this causes confusion because we don't always keep our definitions clearly specified.
I deplore using reproduction as a definition of life. I am alive today, but I have had a vasectomy and I cannot reproduce now.
I deplore confining the definition of life to certain chemical reactions. I think alternate chemical reactions, even mechanical actions, could qualify as life.
I prefer a functional definition of life. It is something that a living thing does, above and beyond just sitting there.
So I define a living thing as something that maintains its own organization in the face of various alternative environmental hazards by various means of such complexity as to keep our minds from analyzing the detailed strategies and forcing us to view the success in a summary fashion.
A rock that keeps its shape just because its hard is merely an unliving rock.
A dog that bites somebody who attacks it is a living thing.
Plants are living by this definition. So are self driving cars.
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