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What are the major groups of microorganisms

• Microorganisms are divided into six types: bacteria, archaea, protozoa, algae, fungi, and viruses.

• Each type has a characteristic cellular composition, morphology, mean of locomotion, and reproduction.

• Microorganisms are beneficial in producing oxygen, decomposing organic material, providing nutrients for plants, and maintaining human health, but some can be pathogenic and cause diseases in plants and humans.