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On Evolution

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Charles Darwin was one of the founders of evolutionary biology. In his book On the Origin of Species he articulated two major points: descent with modification and natural selection.
Descent with Modification
All the contemporary species arose from the succession of ancestors that differed from them. That shows unity and diversity of the life. The unity is in the fact that species share same ancestor and diversity is in great variety of different species of the same origin.

Natural Selection
Darwin started with the following three observations from the nature. First, individuals in populations vary in their traits, many of which seem to be heritable (passed on from parents to offspring). Second, a population can produce far more offspring than can survive to produce offspring on their own. With more individuals, than the environment is able to support, the competition is inevitable. Third, species generally suit to their environments, which means they are adapted to their environments…