Among the lower animals, up even to those first cousins of the vertebrated animals, the Tunicates, the two processes occur side by side, but finally the sexual method superseded its competitor altogether.
He pointed out—writing in a foolish, facetious tone—that the perfection of mechanical appliances must ultimately supersede limbs; the perfection of chemical devices, digestion; that such organs as hair, external nose, teeth, ears, and chin were no longer essential parts of the human being, and that the tendency of natural selection would lie in the direction of their steady diminution through the coming ages.
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Engineers used slide rules before they were superseded by calculators.
No method nor discipline can supersede the necessity of being forever on the alert.
Thoreau, Henry David -- Walden & on the Duty of Civil Disobedience