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Is intelligence prerequisite for fruitful life? Absolutely not, as shown by countless seemingly unintelligent life forms that exist and have existed on Earth. Then why should intelligence evolve on Earth, or anywhere else for that matter? Why not just evolve the most efficient killing machine powerful enough to overpower everything on a planet and be done with it? Look no further than dinosaurs for an answer. Though dinosaurs were built to be capable of perpetuating survival of their species for hundreds of millions of years on Earth, they were utterly hopeless to prevent demise of their gene pool from a large asteroid impact. Those familiar with evolutionary biology probably know already where I’m going with this. If intelligence is as useful for survival as mankind has shown on Earth during its short existence, and if it’s half as useful as it’s likely to be in our endeavor to adapt to the evolutionary/selection pressure as constant and devastating as extinction level asteroid impact, we can reasonably suspect intelligence to have evolved in other extraterrestrial species affected by similar selection pressure. After all, biology as precisely found on Earth is not prerequisite for evolution. Differential propagation of phenotypes based on underlying genetic variability should be all that is needed for evolution to work.
It's about whether intelligence is something unique to humans or whether it could be something more widespread.