The Origin of R Anus

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The evolution of the anus has probably happened multiple times. What was the first and most enduring anises form? Clearly, our ancestor s had something going for them that really worked long term. We will keep converging on an answer but there's no bone that sort of structures the anus.

Once upon a time, there were no anuses. These ingenious organs allowed our primordial ancestors to grow bigger and more complex, but scientists still don’t understand how they evolved. And they’re still grasping at a mystery that literally surrounds it: Why is the human butt so big?

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