To just add a quick note about Shelley's Frankenstein, in terms of applying Darwin's idea of natural selection to it, one could see the monster and Victor as an ironic example of natural selection, biologically speaking.
The monster certainly is fitter, in terms of survival of the fittest. He is superior to humans in general and Victor specifically, in almost every way. He toys with Victor and Victor's idea of revenge. He can escape from, or, for that matter, kill Victor, anytime he wants. In at least one instance, he's even smarter than Victor. He tells Victor that he will see him on his wedding night, apparently knowing that Victor will assume the monster is threatening him personally, when in reality, the monster intends to and does kill Victor's wife.
Yet, biologically, the monster, or his "species," anyway, is vastly inferior to Victor. The monster cannot do the one act that any organism must do to survive--he can't reproduce. And he can't reproduce because Victor refuses...
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