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Originally Posted by Fishteacher73
Life chugged along quite nicely before anything even remotely resembling intelligence arose ... any altercation in the timeline develops a very different world, one that perhaps intelligence is not needed, and therefore not selected for.
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You betcha. I always thought there'd be a big ratio in the Drake equation of "planets with life" and "planets with intelligent life" but I also believe we underestimate the intelligence of animals. Just because they don't build things doesn't mean that dolphins for example aren't more highly evolved or more intelligent than we are ("so long! and thanks for all the fish!")...
There's also the notion from Babylon 5 and a bunch of other SciFi that there might be "waves" of progression: the "Original" civilizations of Bablyon 5 might just actually be us! I'm convinced though that "civilization" is a frequent occurrence, although, not an inevitable one for every planet that evolves life.
Cheers,
Buffy