Nature is relentless for functional continuity. Biology is stubborn for survival. Every student of biology has probably cut an earthworm to study regeneration. If you cut in front, it grows new tentacles - further back a new head and still further a new tail. This is easily done in tadpoles, salamanders, lizards, snails, hydra, and star fish. Indeed, Abbate Spallazani, in 1768 founded (for modern times at least) the doctrine of regeneration of the spinal cord by finding its new growth during regeneration of the tail of the lizard. He published this in 1782 in his book Fisica Animale.
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