Virtually, in order to develop a structure like an eye, you just need a single photosensitive protein (a rhodospin for example), useful for example in order to give a light-dark based idea of spatial orientation (assumed that the nervous system is still developing and capable of integrating new senses, so in early evolutionary times). It's just a matter of time before this protein begins to lead the formation of new structures and specialize, for example by being expressed in a certain kind of cell and in a certain body part, or by integrating other proteins for a better vision and support structures.
Several developing stages of the eye are now found among different clades and classes of animals, suggesting that the eye cannot be taken as an example of irreducible complexity. I am pretty sure that any other "example" of IC can be well explained by evolution.
Several developing stages of the eye are now found among different clades and classes of animals, suggesting that the eye cannot be taken as an example of irreducible complexity. I am pretty sure that any other "example" of IC can be well explained by evolution.
"I cannot persuade myself that a beneficent & omnipotent God would have designedly created the Ichneumonidæ with the express intention of their feeding within the living bodies of caterpillars, or that a cat should play with mice."
Charles Robert Darwin, Letter to Asa Gray (22 may 1860)
Charles Robert Darwin, Letter to Asa Gray (22 may 1860)
