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Isolating mechanisms are biological properties of individuals that prevent the interbreeding of populations that are actually or potentially sympatric.
Ernst Mayr
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biological
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There is absolutely no one, apart from yourself, who can prevent you, in the middle of the night, from sneaking down to tidy up the edges of that hunk of cheese at the back of the fridge.
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Our national determination to keep free of foreign wars and foreign entanglements cannot prevent us from feeling deep concern when ideals and principles that we have cherished are challenged.
Franklin D. Roosevelt
The strength of a civilization is not measured by its ability to fight wars, but rather by its ability to prevent them.
Gene Roddenberry
The chief function of the city is to convert power into form, energy into culture, dead matter into the living symbols of art, biological reproduction into social creativity.
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Conscience is a coward, and those faults it has not strength enough to prevent it seldom has justice enough to accuse.
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