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What percent of habitable planets with life develop intelligent life? This term assumes some form of life on the planets, but that could be just single cellular life. Could a planet simply never develop any more complex form of life? Could it develop complex forms, such as XXX and fish and plants and insects and even mammals, but never develop a species that is intelligent?
Well, what is intelligence and how common is it? Without human beings, would there be intelligent life on Earth? Are dolphins intelligent? Apes? Dogs? Ants? Octopi? And how typical is Earth?
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The development of intelligent life (once some form of life exists) is...
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