We examine evidence across microbial domains, including bacteria, fungi, viruses, archaea, protozoa and helminths, and highlight the impact of dietary transitions and environmental exposures on …

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 suspected from …

Dec 4, 2025 · The major groups of microorganisms—namely bacteria, archaea, fungi (yeasts and molds), algae, protozoa, and viruses—are summarized below. Links to the more detailed articles on …

Aug 4, 2025 · Microorganisms form the biochemical scaffolding upon which all macroscopic life depends. They manage nutrient cycles, influence weather patterns, control atmospheric gases, and …

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 unicellular, there are …

Aug 11, 2025 · Discover the classification of microorganisms, including prokaryotes and eukaryotes, along with examples such as bacteria and fungi.

Microorganisms can be found almost anywhere in the taxonomic organization of life on the planet. Bacteria and archaea are almost always microscopic, while a number of eukaryotes are also …