Microorganisms are tiny, often single-celled organisms invisible to the naked eye. These include bacteria, viruses, fungi, protozoa, and algae. They exist in almost every environment, from soil and water to the human body. While some microorganisms cause diseases, many play vital roles in digestion, immunity, and ecological balance. Understanding microorganisms helps in managing infections, developing vaccines, and promoting better health.                        
                        
                        
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