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 …

Dec 4, 2025 · Microorganisms are of incalculable value to Earth’s ecology, disintegrating animal and plant remains and converting them to simpler substances that can be recycled in other …

Mar 28, 2024 · A microorganism, or microbe, is a tiny living organism that is invisible to the naked eye and can exist as single-celled entities or colonies of cells.

Aug 4, 2025 · Each type of microorganism—bacteria, viruses, fungi, protozoa, and algae—occupies a unique niche in Earth’s ecosystems. Yet they do not exist in isolation.

A microbe, or microorganism, is a microscopic organism that comprises either a single cell (unicellular); cell clusters; or multicellular, relatively complex organisms.

A microorganism is a living entity that is too small to be seen unaided. This term encompasses bacteria, archaea, microscopic fungi, algae, and protozoa; viruses and prions, although not …

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, …

Feb 21, 2023 · A microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye).

A microorganism, or microbe, is an organism (form of life) that is microscopic (too small to be seen by the unaided human eye). Microorganisms can be bacteria, fungi, archaea, or protists, …

Dec 5, 2016 · The meaning of MICROORGANISM is an organism (such as a bacterium or protozoan) of microscopic or ultramicroscopic size.