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Life posesses the<a href="http://lrlbbogrt.com"> cibapality</a> for continuous adaptation, which means it can develop and adjust to its environment.A satisfactory definition of life should not only account for biological life as we know it but also take into consideration artificial / synthesized life forms.Reproduction is not a necessary requirement for life albeit it may be almost sufficient (not entirely though things like fire and crystals such as ice can reproduce and spread).An organism dying because it loses the ability to reproduce in any form (i.e. it cannot create offspring and cannot create new cells, for example, the cells of a nuclear radiation victim lose the ability to split and repair themselves).Common sense tells us that a dying organism is also considered alive until the organism is dead, and organisms that are not able to reproduce may still be alive, and this does not only apply to multi-cell organisms (think of biological rights management (analogous to DRM) as done by Monsanto et al. to prevent genetically modified organisms from creating offspring).I think that some form of development or the potential thereof and some form of metabolism (at least energe-wise i.e. there is some input, a transformation / processing of inputs and some output) are mandatory for something to be considered life.Artificial life forms may have one criterion that substitutes the requirement for reproduction, and that is intelligence.Intelligence and evolution are both manifestations of development, or at least the potential thereof.A thinking machine might never have or develop the ability to reproduce due to its confined intelligence or because it does not have access to hardware for doing so, but I bet you would consider it to be alive (this is similar to people with brain damages or diseases that confine the potential of their minds).Development (or the potential thereof) is sufficient to rule out fire and maybe crystals as forms of life.Note however, that there may be quasi-crystals which create new patterns whenever they grow, so that may be considered development.Additionally, one may note that the formation of particles, atoms, molecules, stars, planets and galaxies constitute some form of development as well.So adjustment (or the potential thereof) may be another criterion going along with development, leading to the concept of adaptation.Hence, I consider continuous adaptation or a potential thereof a pretty good criterion for life as it is necessary and maybe somewhat sufficient.

Entropy rather firobds life from being anything *other* than a reproduction issue, let alone a side one, and also makes immortality all but impossible. No. Babies, children exhibit strong dominance over entropy. Entropy only begins to win when our systems stop dealing with cell replacement properly. Confirmation of this can be found in extremely long-lived organisms. This is a technical issue related to evolutionary consequences and I have extremely high confidence we can solve it.@AdamH: that last individual of a bisexual species still has the ability to reproduce. No. A bisexual species requires one member of both sexes to reproduce. The last member, by definition, only represents a portion of the reproductive mechanism. a condition where an object exhibits some ability and drive to preserve itself and consume external material for internal use. Mmm. Not bad. You'll get some process-based objections, like oxidation (fire, rust, etc.) but still, not bad at all.@BillGaede: Only life has the ability to counteract gravitational attraction. No. Boulders and rocks can roll uphill in the wind. Evaporation of water. Smoke. Volcanic ash plumes. On the other hand, lichen have no particular ability to counteract gravity, nor do viruses they go where the environment takes them, no more.@ David Boulton If it evolves, it’s alive. No. Evolutionary software, which isn't alive by any stretch of the imagination, exhibits every characteristic of evolution, which is really no more than environmental factors pruning less- or un-successful variations, in the context of that environment, on a theme. For example, crystal growth (we're talking about rocks, now) can obtain multiple possible forms, but the environment (temperature, pressure, material distribution, etc.) will prune away all but the form or forms that can accrete in that specific combination of environmental factors.@Gopal: self-awareness No. Germs, viruses, grass, etc. http://dodheyolcxu.com fkbnwow [link=http://baamsfmcwvh.com]baamsfmcwvh[/link]