Although fitness is generally perceived as the central concept of Darwinism, Darwin used the word only once in the first to the fifth, and twice in the sixth, editions of the Origin of Species, and then only in the meaning of adaptedness. In the fifth edition, he, on the recommendation of Wallace, added the phrase ''survival of the fittest,'' due to Herbert Spencer, as synonym for natural selection. However, Darwin's reasoning was throughout qualitative and he nowhere considered quantitative measures that might determine the speed of evolutionary change.

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10 Ways To Fight Off Cancer

10 Ways To Fight Off Cancer

Learning About 10 Ways Fight Off Cancer Can Have Amazing Benefits For Your Life The Best Tips On How To Keep This Killer At Bay Discovering that you or a loved one has cancer can be utterly terrifying. All the same, once you comprehend the causes of cancer and learn how to reverse those causes, you or your loved one may have more than a fighting chance of beating out cancer.

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