It does appear that some parts of our evolutionary process seem inevitable. It is striking that throughout evolutionary history, the eye evolved independently fifty to a hundred times. This is strong evidence for the fact that the different rolls of the dice that have occurred across different species seem to have produced species with eyes regardless of what is going on around them. Lots of other examples illustrate how some features, if they are advantageous, seem to rise to the top of the evolutionary swamp. This is illustrated every time you see the same feature appearing more than once in different parts of the animal kingdom. Dolphins and bats, for example, use echolocation, but they evolved this trait independently at very different points on the evolutionary tree. Marcus Du Sautoy
About This Quote

Echolocation is the ability of some animals to see objects by making high-pitched sounds and interpreting their echoes. This is the trait that bats and dolphins have independently developed.

Source: The Great Unknown: Seven Journeys To The Frontiers Of Science

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