"Engineering, chemistry, information processing – all are involved every time we open our eyes. Charles Darwin once stated that the thought of the eye, and how it could possibly be produced by natural selection, made him ill. Here’s why:
The human eye could not have evolved over long periods of
time, because it is absolutely useless unless complete. The lens, which focuses light, would be useless without the retina, which senses light. And all the light received would serve no purpose without the nerve fibers which carry signals to the brain.
Vision involves a complete system of organs – all interrelated, all thoroughly designed. That’s the way it is with the whole human body. Lungs and heart, nerves and muscles, all perform incredibly complicated tasks that depend on other incredibly complicated tasks.
No wonder the Psalmist concluded that the human body speaks loud and clear of a wonderful Creator:- “I praise you because I am fearfully and wonderfully made; your works are wonderful, I know that full well.”
—Psalm 139:14." DiscoverOnline