How did darwin reach the principle of natural selection, Biology

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How did Darwin reach the principle of natural selection from the observation of differences among individuals of the same species?

The Darwin recognized that in a same species there were individuals with different characteristics. He also realized that the differences could lead to different survival and reproduction chances for each individual. Consequently he discovered the importance of the environment acting upon organisms and preserving those having more beneficial characteristics for survival and more able to generate offspring and so he described the basis of the principle of natural selection.

 


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