As populations of species moved into vernal habitats and new parts of the world, they face up distinguishable environmental conditions. Over time, these populations accumulated modifications, or adaptations, that allowed them and their manifestation to wear better in their new environments. These modifications were the key to the evolution of new species, and Darwin proposed natural selection or "survival of the fittest...If you indigence to catch a full essay, order it on our website: OrderEssay.net
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