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Microorganisms are classified into four major groups. These groups are bacteria, fungi, protozoa and:

AInsects
BPlants
CAlgae
DAnnelids
Answer & Solution
Correct answer: C. Algae
The four major groups of microorganisms named in the chapter are bacteria, fungi, protozoa and algae. Viruses, though microscopic, are considered separately because they reproduce only inside a host.
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