Which of the following microorganisms is a protozoan that contaminates water and is a human pathogen?

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Giardia lamblia is a protozoan that contaminates water and is a human pathogen. Asperigillus flavus is a mold that produces a carcinogen, Hepatitis A is a viral infection transmitted through contaminated food or water, Trichinella spiralis is a parasitic roundworm found in raw or undercooked meat, and Escherichia coli is a bacterial species found in the human gut and can cause illness if certain strains are ingested.

Which of the Following Microorganisms Is a Protozoan That Contaminates