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How did certain elements evolve? How did an eye, a wing or an ear, for example, evolve? A half evolved wing, or ear is useless, and would be a hinderance to the creature concerned. The mutation would die off before it got a chance to fully develop.
How does evolution 'know' what an eye should look like?
Photosensitive organs have developed independantly in different organisms at least 40 times, facilitated by a gene common to all 'Pax 6', which regulates the nervous system. In molluscs the evolution of the eye started with a pigmented spot (which became the retina) linked to nerve fibres. Then developed a cup which became a water filled cavity (becoming the lens). Complex eyes since developed involving the iris and cornea also. You can go out and take a look for yourself at these various stages of complexity in currently living organisms.
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