wellwisher The DNA we have in common with a Banana is doing exactly the same job in Bananas as it does for us. That DNA developed before either us or bananas existed and it did it's job so well that there is no evolutionary pressure for those particular genes to ever change and they are spread throughout life. We have those genes in common with almost all life and mutation in those genes is almost always fatal to the organism. But Natural Selection is not random. Mutations to an individual's DNA are tested by whether that organism survives to reproduce(and thereby continue that mutation in their offspring, preserving it). Fatal mutations kill that organism before it can pass on that mutation into the gene pool. Only those mutations that do not prevent reproduction are passed on. That is the first stage of testing, survival to reproduce. But even non-lethal mutations are tested by the struggle for reproduction(what we call our lives), if that non-lethal mutation confers a better ability to survive and reproduce it will be preserved(by the survival of more offspring who have that particular mutation), while one that is neutral will survive less often, and those non-lethal mutations that hinder reproduction or even reduce it just a little bit will become less common in the gene pool. All by the simple act of reproduction(a simple, binary, pass/fail test, the outcome of which is not random). That is Natural Selection, mutations tested by whether they assist or prohibit survival to reproduce. Those that survive pass their genes on, those that don't reproduce do not. Genes that assist in survival are preserved, those that don't are eliminated. Nothing random about the process. matthew809 Demonstrably false. Please Register or Log in to view the hidden image! Each of these "eyes" can be seen in Nature, from light sensitive patches of skin to the camera eye they all give an evolutionary advantage, each improvement, however small, being preserved and passed to the next generation. Give it a few billion generations and you have your eyes coming from incremental improvements applied to the original heat sensitive patch of cells. This is undeniable for those who know the facts, only those who have an agenda deny it. Your objections are not based in science, they are based on your beliefs about your god. There is no such thing as Irreducible Complexity in evolution, it is bogus pseudo-scientific babble. GrumpyPlease Register or Log in to view the hidden image!