Can Evolution Make an Eye? - 12 Days of Evolution #4
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[MUSIC] [BIRD CHIRP] 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 to...
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[MUSIC] [BIRD CHIRP] 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 to...
