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  2. Microorganism - Wikipedia

    en.wikipedia.org/wiki/Microorganism

    There is evidence that 3.45-billion-year-old Australian rocks once contained microorganisms, the earliest direct evidence of life on Earth. [1] [2] Microbes are important in human culture and health in many ways, serving to ferment foods and treat sewage, and to produce fuel, enzymes, and other bioactive compounds.

  3. Global biodiversity - Wikipedia

    en.wikipedia.org/wiki/Global_biodiversity

    A May 2016 study based on scaling laws estimated that 1 trillion species (overwhelmingly microbes) are on Earth currently with only one-thousandth of one percent described, [28] [29] though this has been controversial and a 2019 study of varied environmental samples of 16S ribosomal RNA estimated that there exist 0.8-1.6 million species of ...

  4. Bacteria - Wikipedia

    en.wikipedia.org/wiki/Bacteria

    Most bacteria have not been characterised and there are many species that cannot be grown in the laboratory. The study of bacteria is known as bacteriology, a branch of microbiology. Like all animals, humans carry vast numbers (approximately 10 13 to 10 14) of bacteria. [3] Most are in the gut, though there are many on the

  5. Lists of organisms by population - Wikipedia

    en.wikipedia.org/wiki/Lists_of_organisms_by...

    Recent figures indicate that there are more than 1.4 billion insects for each human on the planet, [27] or roughly 10 19 (10 quintillion) individual living insects on the earth at any given time. [28] An article in The New York Times claimed that the world holds 300 pounds of insects for every pound of humans. [28]

  6. List of human microbiota - Wikipedia

    en.wikipedia.org/wiki/List_of_human_microbiota

    The oral microbiota consists of all the microorganisms that exist in the mouth. It is the second largest of the human body and made of various bacteria, viruses, fungi and protozoa. [14] These organisms play an important role in oral and overall health. Anthony Van Leeuwenhoek was the first to view these organisms using a microscope he created ...

  7. Microbiology - Wikipedia

    en.wikipedia.org/wiki/Microbiology

    The Roman Marcus Terentius Varro made references to microbes when he warned against locating a homestead in the vicinity of swamps "because there are bred certain minute creatures which cannot be seen by the eyes, which float in the air and enter the body through the mouth and nose and thereby cause serious diseases." [9]

  8. Human microbiome - Wikipedia

    en.wikipedia.org/wiki/Human_microbiome

    Graphic depicting the human skin microbiota, with relative prevalences of various classes of bacteria. The human microbiome is the aggregate of all microbiota that reside on or within human tissues and biofluids along with the corresponding anatomical sites in which they reside, [1] [2] including the gastrointestinal tract, skin, mammary glands, seminal fluid, uterus, ovarian follicles, lung ...

  9. List of bacteria genera - Wikipedia

    en.wikipedia.org/wiki/List_of_bacteria_genera

    The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) [1] and National Center for Biotechnology Information (NCBI). [2] However many taxonomic names are taken from the GTDB release 08-RS214 (28 April 2023).