Final answer:
Microsporidia are unicellular fungi, not bacteria. They lack certain organelles and can cause human diseases. Viruses require a host to replicate.
Explanation:
Microsporidia are unicellular fungi that are obligate intracellular parasites. They lack mitochondria, peroxisomes, and centrioles. One pathogenic species, Enterocystozoan bieneusi, can cause symptoms like diarrhea and respiratory illness.
Microsporidia belong to the fungi kingdom, not the bacteria domain. They are classified as fungi, not bacteria.
Viruses are acellular microorganisms that require a host to reproduce.
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