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a metabolism? I've read in many places now that "life" is very difficult to define. A big question in biology, paleontology, or science in general is "what is life?" or "how do we define life?". NASA's definition is "A self-sustaining chemical system capable of Darwinian evolution". But I'm just wondering why life shouldn't be defined as "anything with a metabolism". Has anything ever lived that didn't have a metabolism? Is there anything that is non-living that does have one? Thanks. Scott