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Your eyes are beautiful.
They’re amazing bits of biological engineering.
Just like a camera, remove one of their intricate
parts, and the eye can’t do its job.
For this reason, many people think eyes couldn’t possibly arise from a blind process like natural
selection. But that idea doesn’t hold vitreous fluid.
Light-sensitive cells first showed up in simple single-celled creatures, helping them swim
towards the sun. Cup-shaped light spots then began to let creatures
sense light’s direction. Deeper pits eventually formed a pinhole iris,
increasing the eye’s resolution. Some animals developed a protective, crystalline
covering over the iris, which later allowed them to focus and control the light entering
their eye. This is essentially the eye we have today.
Computer simulations have replayed this selective process in just 350,000 generations, showing
simple light patches can evolve into camera-like eyes in tiny, adaptive steps,
1,829 to be precise.
Nature took a little longer than that, but
genes, biochemistry, fossils, and anatomy all tell the same story. Eyes are pretty easy
to evolve. So easy that nature has done it independently 50 to 100 times.
This kind of complexity, rather than overthrowing Darwin’s theory, is proof of its power.
So whether it’s an eagle observing ants from atop a skyscraper, a mantis shrimp scanning
circularly polarized light, or you watching YouTube videos, there’s room for an eye
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