How Do Microorganisms Poop Without a Butthole?

From Journey to the Microcosmos.

Everybody poops, but how does one poop when one does not have a butthole?

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SOURCES:
https://encyclopediaofarkansas.net/entries/gastrotrichs-14661/
https://www.nature.com/articles/s41598-019-43977-y
https://animaldiversity.org/accounts/Gastrotricha/
https://www.thoughtco.com/the-life-of-an-amoeba-4054288
https://ucmp.berkeley.edu/protista/ciliata/ciliatamm.html
https://www.sciencedirect.com/science/article/pii/S004452311500011X
https://www.micrographia.com/specbiol/cnidari/hydrozo/hydr0100.htm
http://www.bbc.com/earth/story/20150313-the-origin-of-the-anus