The DNA codes for spatial arrangements of cells in the form of functional bio-structures. A heart valve is one such arrangement, while the ear is another. In between you have a nearly infinite number of junk arrangements. You can't just wave a magic wand of mutations and jump from one bio-functional arrangement of cells to another, and than claim - natural selection did it! |
But mutations often do get us from one functioning organism to another. These mutations are of course not caused by natural selection, but they are preserved by it.