A man is brought to the hospital suffering from nausea, vomiting, and severe stomach cramps. He had recently returned from a hiking trip in northern Minnesota. A sample taken from the man shows a single- celled flagellate organism that lacks mitochondria but has two nuclei. This organism is a(n)

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The organism described is an excavate, specifically Giardia, which is a flagellate protozoan that lacks mitochondria and has two nuclei. It is known to cause gastrointestinal symptoms and is often contracted from contaminated water sources, such as those found in hiking areas.

A Man Is Brought to the Hospital Suffering from Nausea