The irreducible complexity of organs precludes the possibility of natural selection's ability to produce and preserve any beneficial advantage in evolving new species. The eye is a notable case in point, Darwin himself admitting its staggering complexity.
Evolution: “science” becomes unscientific
The proof that Darwin required to prove his theory has not surfaced. Evolutionists led by Stephen Jay Gould have so altered Darwin's theory that the transitional fossils needed to prove evolution are no longer necessary. "Punctuated equilibrium" keeps the Darwinian framework without requiring the evidence that Darwin himself required. Many Darwinist "scientists" are now adopting an unscientific methodology that makes the theory unfalsifiable. Yet Genesis 1 explains what we observe in the fossil record.
Evolution: a theory in search of evidence
Key to evaluating the evidence of evolution is the distinction between macro and microevolution. Creationists don't dispute microevolution, the observation that species adapt to their environment. Yet biology textbooks cite examples of microevolution to make macroevolutionary conclusions: microevolution leads to speciation, or totally new species. Transitional fossils, the proof that Darwin insisted would prove or disprove his theory, are "extremely" rare, and persists as "the trade secret of paleontology. Supporters of evolution have significantly modified Darwin's theory, making it virtually untestable and unverifiable, an approach that is unscientific.