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Darwin believed and theorized that species competed for existence over many years and evolved to be what they are today. Species will battle for the fittest because they are on the food chain. For example, when a bear eats a fish the bear is ending the life of the fish and therefor the fish can't go on to reproduce and possibly evolve. The bear is also increasing his chance of living to reproduce by eating the fish. So, the species with the fittest genetics will most likely reproduce and pass on that genetics to the next generation. His explanation for the evolution of species was natural selection.

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