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I have no 'evidence' for higher intelligence. I have 'reasons and opinions' for it plausibility though.
Of billions of species that lived and live only one on this planet has evolved as we have. Why just one? Reasoning based on the evolution of other primate species says there should be at least a few species on this earth with our brain capacity.
We have an unnumbered amount of solar systems and galaxies in the universe. We are one of the younger solar systems. We have no evidence for like life on another planet anywhere we can see/view. It can't be a chance happening that after billions of years matter happened to produce life on this planet and didn't do it before several times at least. Reasoning states we should be visited by people as ourselves from other planets with the same natural resources we have that caused their evolution. That they would have been around for so long that they would be teaching us their knowledge.
But that isn't how it is. I am to understand from evolutionists in billions of years a single solitary moment occurred on this single planet and unlike any other planet life evolved to what it is now. And people claim the theory of creationists is hard to swallow? Alrighty...lol.
"Reasoning based on the evolution of other primate species says there should be at least a few species on this earth with our brain capacity."
Your reasoning is flawed....one doesn't necessarily follow the other.
So far as we can tell at this point, our abilities stem from one little defect(?) in our DNA giving us humans 46 chromosomes instead of 48 like other primates. No 2 fused