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Sagot :
Early eyes may have been simple eyespots that could only distinguish between light and dark. Later, some animals developed spherical eyes that could focus light onto an image.
Critical to the eyes that form these images was the development of lenses that could focus the light. The complex human eye may have evolved through natural selection acting on small changes, from simple patches of light-sensitive cells to producing sharp images. Not in an obvious way, but possible further intermediates were certainly advantageous. Many scientists are fascinated by studying the evolution of the eye because the eye is a clear example of similar organs found in many animal forms. Simple light detection is found in bacteria, protozoa, plants and animals. This review traces the evolution of vision from a putative origin in cyanobacteria to humans. Circadian clocks, phototropism, and phototaxis require the ability to detect light. Photosensory proteins allow us to reconstruct the molecular phylogenetic tree.
To know more about Circadian clocks, visit:
https://brainly.com/question/14300618?referrer=searchResults
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