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[font:Arial Black]The first organisms to benefit from guts got by with just a mouth, through which food went one way and waste the other. However, as the organisms grew in size and length, having one hole for everything became impractical.[/font] "A long gut makes sorting food and waste through a single opening inefficient," says Andreas Hejnol, a researcher at the University of Hawaii in Honolulu and one of the study's authors. "So they needed to evolve an anus."

 

 

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...they propose that, in some lineages, the anus may have formed through a fusion of the gut with the reproductive organs.

Thia may explain why so many men and women, who are obsessed with sex, are assholes.

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