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Updated: May 4, 2025
Yet all the while we are dealing with a problem in biology, with living beings, obeying and determined by the laws of life, and with a species exhibiting those fundamental facts of heredity, variation, bi-parental reproduction, sexual selection, instinct and the like, which are mere meaningless names to nine out of ten of the disputants, and yet which determine them and their disputes and the issues thereof.
Why nature determined that each new life in the vast majority of species should develop from two other lives has long been a biological puzzle, and most satisfactory of the answers given is that bi-parental origin of new individuals allows for new combinations of heritable qualities from two lines of descent.
But the interdependence of the sexes is so far from being a new fact that it is as old as the evolution of sex, and the decadence and disappearance of parthenogenesis or reproduction from the female sex alone. Once bi-parental reproduction becomes necessary for the continuance of the race, both sexes sink with either, and neither can swim but with both.
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