A specimen from a patient suffering diarrhea shows a one-celled organism in the microscope. The organism moves very slowly by protruding its cytoplasm. You would predict that the patient has an infection caused by ______.

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Entamoeba, specifically Entamoeba histolytica, is a one-celled organism that moves by extending its cytoplasm in a process known as amoeboid movement, which is consistent with the description given. It is a common cause of amoebic dysentery, which includes symptoms such as diarrhea.

A Specimen from a Patient Suffering Diarrhea Shows a One-Celled