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[life] Where Do Butts Come From? … A look at the the evolutionary history of the anus. ‘The sea cucumber’s posterior is so much more than an exit hole for digestive waste. It is also a makeshift mouth that gobbles up bits of algae; a faux lung, latticed with tubes that exchange gas with the surrounding water; and a weapon that, in the presence of danger, can launch a sticky, stringy web of internal organs to entangle predators. It can even, on occasion, be a home for shimmering pearlfish, which wriggle inside the bum when it billows open to breathe. It would not be inaccurate to describe a sea cucumber as an extraordinary anus that just so happens to have a body around it.’

The Evolutionary History of the Anus

This entry was posted on Friday, May 21st, 2021 at 11:45 am and is filed under Life.

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