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Evolution is a theory that explains why animals and plants are so good at surviving in their environments. That means species change over time. The theory of evolution was developed by Charles Darwin in 1859. Darwin believed that evolution work through natural selection. For example, rabbits live all over the earth. Rabbits who in the forest have brown hair, and are good for the forest by eating lower leaves and twigs. They help the forest survive. Rabbits who live in snow covered areas have white fur and are far more likely to survive as their coloring matches their environment. Charles Darwin would call this "survival of the fittest" because animals who fit better into the ecosystem are far more likely to live.
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