“There is nothing in natural selection that allows you to predict any particular pattern that it might generate.” —Henry Gee
“Life is not oriented towards increasing complexity, nor is it fated to become ever more complex.” —Alexandre Meinesz
When most people hear the word aliens, as in life from other worlds, they immediately picture something that is strongly humanoid—upright, two legs, two arms, a trunk, one head, two eyes, etc. This limited line of imagination is almost totally due to science fiction writers and filmmakers. There is absolutely no scientific reason to assume that the humanoid form is a probable outcome for evolution on another planet, and highly intelligent humanoids are even less probable. Though it has obviously come about here on Earth, it certainly didn’t have to happen— it was just one of countless millions of possibilities that chanced to materialize from Earth’s evolutionary process.
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