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The inferior (disadvantaged) members of the same species would gradually die out, leaving only the superior (advantaged) members of the species.
Natural selection is the preservation of a functional advantage that enables a species to compete better in the wild.
Ancient Greek philosophers such as Anaximander postulated the development of life from non-life and the evolutionary descent of man from animal.
Charles Darwin simply brought something new to the old philosophy -- a plausible mechanism called "natural selection." Natural selection acts to preserve and accumulate minor advantageous genetic mutations.
It is composed of five basic parts: a catch (to hold the bait), a powerful spring, a thin rod called "the hammer," a holding bar to secure the hammer in place, and a platform to mount the trap.  Darwin's Theory of Evolution - A Theory In Crisis Darwin's Theory of Evolution is a theory in crisis in light of the tremendous advances we've made in molecular biology, biochemistry and genetics over the past fifty years.
If any one of these parts is missing, the mechanism will not work. We now know that there are in fact tens of thousands of irreducibly complex systems on the cellular level.
If even one part is missing, the entire system will fail to function.  Thus, such a system could not have evolved slowly, piece by piece.
Molecular biologist Michael Denton wrote, "Although the tiniest bacterial cells are incredibly small, weighing less than 10 grams, each is in effect a veritable micro-miniaturized factory containing thousands of exquisitely designed pieces of intricate molecular machinery, made up altogether of one hundred thousand million atoms, far more complicated than any machinery built by man and absolutely without parallel in the non-living world."  And we don't need a microscope to observe irreducible complexity.Darwin wrote, "…Natural selection acts only by taking advantage of slight successive variations; she can never take a great and sudden leap, but must advance by short and sure, though slow steps."  Thus, Darwin conceded that, "If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down."  Such a complex organ would be known as an "irreducibly complex system".An irreducibly complex system is one composed of multiple parts, all of which are necessary for the system to function.Darwin's interest in shooting and hunting was not unusual in nineteenth century England, but he carried it far beyond that of most of his contemporaries.Many people hunt for food and/or sport, then as well as now, but wanton killing for its own sake can hardly be justified. would stay with him through all the years of his formal schooling and some years beyond" (Gale, 1982, p. Darwin loved killing so much that when he killed his first bird, he literally trembled with excitement.