On the Origin of Species by Charles Darwin

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What are the conditions necessary within a population for Evolution by Natural Selection to occur?

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According to Darwin's Theory of Natural Selection, living things in a population tend to over-reproduce. However, individuals within a population have variations(differences). Competition then occurs within the environment, which is the selecting agent and those individuals with the variations that allow them to survive may win the struggle for existence. If these variations are heritable, these individuals may mate and pass down those traits to...

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