If it could be demonstrated that any complex organ existed which could not possibly have been formed by numerous successive slight modifications my theory would absolutely break down. But I can find no such case.
Charles Darwin
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I have called this principle, by which each slight variation, if useful, is preserved, by the term of Natural Selection.
- Charles Darwin -
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A moral being is one who is capable of reflecting on his past actions and their motives – of approving of some and disapproving of others.
- Charles Darwin -