In this video Dr. Dan Kuebler is describing how the camera-like eye, present in a variety of animal species (including humans), is an example of "convergence". It's just a good way to harness light and if we reran evolution the camera-like eye would almost certainly be prominent in the biological landscape.
More biological evolution resources
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Purposeful Universe
The Purposeful Universe seeks to explore and present, through award winning videos, the abundant order in nature that funnels biological systems toward increasing levels of complexity and sophistication—suggesting that human life is the purposeful outcome of a complex, ordered system.