In addition to your duties as phlebotomist/microscopist for you Peace Corps team in Honduras, you are also, as the junior team member, responsible for collection of stool samples and the performance of fecal floatations. While processing "samples" in search of parasite ova, you detect the presence of numerous cysts roughly 10-20 microns in diameter, that almost look like faces, plus you see trophozoites that are flagellated and are almost cute, also like faces. Upon cross-referencing the patient case histories you note that all individuals got their drinking water from a new well, and the water was not treated with chlorine or boiled before they drank. There are abundant wild animals, including Nutria, which are like beavers. You also see that these "cyst" positive patients all had abdominal cramping and profuse, somewhat greenish diarrhea with a lot of flatulence (farting). When you write up your interpretation of the fecal smear and floatation results, which of the following organisms do you indicate as the cause of these infections?

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