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One myth speaks of ouroboros, a serpent-like creature that survived and regenerated itself by eating only its own tail.
Assuming that ouroboros was an isolated system (i.e.
, it received no energy from the sun or the environment and emitted no energy during any process), ouroboros' existence would have violated neither the conservation law for mass nor the FLT (which states energy is conserved).
However, unless it was a revers- ible creature, ouroboros' existence would have violated the second law (which states that exergy is reduced for all real processes), since ouroboros would have had to obtain exergy externally to regenerate the tail it ate into an equally ordered part of its body (or it would ultimately have dissipated itself to an
Thus, ouroboros would have to have had an impact on its environment.
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