[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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