Question: How can evolution produce complex organs like the eye?

Chloe Kinsella answered on 14 Nov 2014:

The eye is an extremely complex organ. It is much easier to study the evolution of hard parts of the body, such as bone, as they fossilize and we can compare bones from thousand of years ago to modern day. Soft body parts like the eye rarely fossilize and when they do, don’t include as much detail.However, biologists have recently got closer to tracing the origin of the eye. By studying how the eye forms in developing embryos and by comparing eye structure and genes across species, they can guess when these traits evolved. The results indicate that our kind of eye (the type common across vertebrates) was created in the last 100 million years, evolving from a simple light sensor for daily and seasonal rhythms around 600 million years ago to an optically and neurologically sophisticated organ by 500 million years ago.