The anal opening or excretory pore in certain single-celled organisms like protozoans.
From cyto- (Greek kytos, 'cell') + -proct (Greek proktos, 'anus' or 'rear opening'). This specialized biological term was coined to describe a specific anatomical feature in microscopic organisms.
Some single-celled organisms like paramecia have dedicated waste-disposal openings just like we do, which shows that even the tiniest creatures need plumbing systems to stay healthy!
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