In the abstract, it might be tempting to imagine that irreducible complexity simply requires multiple simultaneous mutations - that evolution might be far chancier than we thought, but still possible. Such an appeal to brute luck can never be refuted... Luck is metaphysical speculation; scientific explanations invoke causes.
Michael J. Behe, Darwin's Black Box: The Biochemical Challenge to Evolution
biology, chance, darwinism, evolution, id, intelligent-design, luck, macro-evolution, macroevolution, mutation, naturalism, science, serendipity