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Organisms differ because their DNA differs from one species to another, and from one member of each species to another.

Organisms differ because according to 'Darwinian science' creatures evolve to fill niches of ecological web. In other words, when species evolve it is to become better adapted to their environment, have a greater aptitude at surviving and then feed on what used to be its predators- who in turn adapt to survive. As this system progresses entropy increases causing an ever increasing diversity of life-forms.

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