| The first condition is inheritance |
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 | Hello son good to see you | |
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| You too Pa, boy I sure am lucky to have inherited your genes, I am the fastest kid in school | |
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| The second condition is variation |
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| I sure do love living in America, the melting pot of the world | |
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| Indeed the variety of the people living here is exceptional | |
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| The third condition is differential survival and reproduction |
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| Lets get married | |
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| Sounds good I can outlast any other man that might come around here | |
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