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Originally Posted by stulagu
Dolphins have thumbs, two legs that make up their tail, a belly button, their blowhole is two nostrils, they even have hair, and they have sex for pleasure. They are a lot more physically similar (especially in body to brain ratio) than most apes.
The chromosomes with a starfish will be harder for me to find, I wrote my research paper over a decade ago. (I'm editing here...adding that a lot of the starfish/human studies are based on limb regrowth...there are enough similarities between the two species that scientists are really researching it. Though science also says that horses and bats have more similar dna than horses and cows...so...)
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That just demonstrates that a posteriori knowledge is not certain. Constructing an ancestral tree requires some guesswork and IRL we only get degrees of certainty.
John Locke called...
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The big bang theorists totally believe that all life came from primordial sludge, and where did the common ancestor come from then?
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There is a difference between "came from" and "used to be"