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Darwin's Contribution
It was the theory of natural selection - not the theory of evolution - that was Darwin's most original contribution to biology.
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Natural Selection is a very simple idea. So simple, in fact when a Friend of Darwin (T H. Huxley) first heard of it, he exclaimed- "How stupid of me not to have thought of it before".
Yet Natural selection is also a powerful idea, for it can explain all the complex order we see around us in biological world.
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