Microorganisms are single-celled or unicellular organisms such as bacteria, viruses, fungi , and archaea. They can grow and live in various environments like soil, ocean, inside rocks and animals. Some microorganisms are involved in an endosymbiotic relationship and others may cause serious health issues in humans and animals.

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Chapter 4.2, Problem 2MQ

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Microorganisms are single-celled or unicellular organisms such as bacteria, viruses, fungi, and archaea. They can grow and live in various environments like soil, ocean, inside rocks and animals. Some microorganisms are involved in an endosymbiotic relationship and others may cause serious health issues in humans and animals.

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