Evolution Trivia Quiz

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9. But what about the human eye?

To people new to the subject, it often seems that the evolution of complex structures like the eye, with its intricate interrelated parts, each necessary to the whole, simply could not have arisen by a series of random mutations. According to scientists who have studied the matter, however:

A) Eyes evolve readily, and have appeared independently on multiple occasions
B) It is safe to assume that an undiscovered principle makes such development possible
C) Over many eons, some improbable developments like eyes are bound to occur
D) The great usefulness of a fully evolved eye imposed strong pressure to develop it

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Darwin confessed to amazement that evolution working by blind random mutations could give rise to such a remarkable end product as the human eye. Nevertheless, he maintained, the eye could and did evolve from the simplest of beginnings, and by incremental steps, a verdict that current science supports. It has been estimated that a primordial eye, consisting of no more than a patch of light-sensitive cells, could be expected to evolve into a complex eye in only a few hundred thousand years. It may seem astonishing that eyes have evolved in different animal groups, and with a variety of designs, but hundreds of millions of years of animal evolution have in fact provided ample time for it.

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