
The Ecology of Bird Communities
John A. Wiens, H. J. B. Birks, J. A. Wiens
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According to polling data, most Americans doubt that evolution is a real phenomenon. And it's no wonder that so many are skeptical: many of today's biology courses and textbooks dwell on the mechanisms of evolution-natural selection, genetic drift, and gene flow-but say little about the evidence that evolution happens at all. How do we know that species change? Has there really been enough time for evolution to operate?
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