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A unicellular parasite is: A. A protozoan. B. A zoonosis. C. Coenurus. D. A trematode.

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Answer: A. Protozoan

Step-by-step explanation:

According to the CDC, “Protozoa are microscopic, one-celled organisms that can be free-living or parasitic in nature. They are able to multiply in humans, which contributes to their survival and also permits serious infections to develop from just a single organism.”

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