It is easy enough to make up stories of how one form gave rise to another, and to find reasons why the stages should be favoured by natural selection.  But such stories are not part of science, for there is no way of putting them to the test.

 

Patterson*, Colin, Personal Letter to Luther D. Sunderland, April 10, 1979.

*Dr. Patterson was the Senior Paleontologist at the British Museum of Natural History in London.

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