On the Origin of Species by Charles Darwin

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What are Darwin's supporting arguments in On the Origin of Species? What is his thesis and supporting arguements?

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In Darwin's theory, he noted that all species tend to over-reproduce. He mentioned that if they all survived, the population would grow, however, most populations remain stable. They are competing for resources--food, shelter, space, mates, etc. Therefore, there is a struggle for existence. All members in a population have differences called variations. If an individual has a variation that helps it survive, it may live and reproduce and pass this on to offspring....

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