Evolution and natural selection teaches that any creature or trait that isn't beneficial or useful to other creatures will gradually become extinct. I'm not talking about "wishy washy" purposes, just logical purposes to the ecosystem.
And in response to the argument that our planet is not a living organism, rather nothing but a dead, cold rock:
Looks like quite a bit of complex and constantly changing activity for a rock in space that's supposed to be lifeless except for the surface. Ironically, this view is shallow.
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