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 absence of mitochondria and presence of two nuclei are characteristic of excavates. Some examples of excavates include Giardia lamblia, which can cause gastrointestinal illness in humans, and Trypanosoma brucei, which causes African sleeping sickness.

A Man Is Brought to the Hospital Suffering from Nausea