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Charles Darwin was a __1__ scientist. He spent nearly 20 years __2__ his analysis and ___3__ his prose before publishing his __4___ work, On the Origin of __5__. But 150 years ago, Darwin was sailing into ___6___ waters. The Church of England had set __7___ boundaries, and his thesis was a challenge to the ___8___ view. Today, his core idea is the __9__ of modern life sciences, and his theory of "natural ___10___" becomes a foundation of modern evolutionary biology.