... . In the introduction of the book Darwin begins with his argument of evolution by examining the different variation within domestic animal groups. His primary example of variation is the domestic pigeon. Darwin explains that all were developed from the rock pigeon. This was because of the selective traits that were very closely related to the physical structure of the rock ... pigeon. Species had fixed boundaries, many traditional scientists believed. If the selective pressure was abandoned, within a couple of generations the pigeons would have returned to "normal." Darwin was emphasizin...

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