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| Do you know Charles Darwin? | |
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| Yeah, he is an English naturalist. | |
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| What else do you know about him? | |
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| Darwin came to believe that the variation among the members of a species is essential to survival of the species in natural environments. | |
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| Oh. By the way, did you know that, as theory, ethological theory suffers from serious problems of verifiability. | |
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