Thus Charles Darwin on what evolution might do. Although it hadnot yet made a whale-bear with a taste for aquatic insects, it could. After all, evolution had already produced such improbable creatures as a fish that skimmed the air. The idea oflife as fixed in a divine mold was dead. Instead, all was change. BeforeDarwin, the great majority of naturalists believed that species were immutable productions, and had been separately created. Today, his theory that they undergo modification and are the descendants of preexisting forms is accepted by everyone (or by everyone not determined to disbelieve it) . Most people would, if asked, find it hard to explain why. We all know that men and chimps are relatives and that plants, animals and everything else descend from a common ancestor. [download]
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