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  1. Microorganism - Wikipedia

    A microorganism, or microbe, [a] is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells. The possible existence of unseen microbial life was …

  2. Microbiology | Definition, History, & Microorganisms | Britannica

    Dec 4, 2025 · Microbiology, the scientific study of microorganisms, a diverse group of generally minute simple life-forms, including bacteria, algae, and viruses. The field is concerned with the …

  3. Microorganisms Definition - Microbiology Key Term | Fiveable

    Microorganisms, also known as microbes, are tiny living organisms that are invisible to the naked eye. They include a diverse group of microscopic life forms such as bacteria, archaea, fungi, …

  4. 1.7: Types of Microorganisms - Biology LibreTexts

    Microorganisms differ from each other not only in size, but also in structure, habitat, metabolism, and many other characteristics. While we typically think of microorganisms as being …

  5. Microbiome science: Understanding your body’s ... - Mayo Clinic …

    3 days ago · Did you know that you have trillions of tiny organisms living on and inside your body? This amazing collection of microbes – your microbiome –…

  6. Microorganisms | Open Access Journal | MDPI

    Microorganisms is a scientific, peer-reviewed, open access journal of microbiology, published monthly online by MDPI.

  7. What Is Microbiology? Exploring the Microscopic Life That Powers …

    Aug 4, 2025 · Microorganisms are not a single kingdom of life, but rather a sprawling, diverse collection of life forms across multiple domains. Bacteria and archaea, the two groups known …

  8. Microorganism - Ask Microbiology

    Microorganisms constitute a vast and diverse group of life forms that span all domains. Bacteria and archaea are prokaryotes that lack a membrane-bound nucleus. They vary in morphology, …

  9. DOE Explains...Microbiology - Department of Energy

    Microorganisms (also known as microbes) are essential to life on Earth; complex organisms (including human beings) would find it nearly impossible to survive without them. These tiny …

  10. Microorganism - an overview | ScienceDirect Topics

    Microorganism is a class of biological cells constituting a vast domain of prokaryotes, and typically include bacteria, fungi, viruses, and microalgae, etc. Microorganism is micrometres in size and …