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  2. Bacteria - Wikipedia

    en.wikipedia.org/wiki/Bacteria

    They live on and in plants and animals. Most do not cause diseases, are beneficial to their environments, and are essential for life. [4] [34] The soil is a rich source of bacteria and a few grams contain around a thousand million of them. They are all essential to soil ecology, breaking down toxic waste and recycling nutrients.

  3. Microorganism - Wikipedia

    en.wikipedia.org/wiki/Microorganism

    Bacteria and archaea are almost always microscopic, while a number of eukaryotes are also microscopic, including most protists, some fungi, as well as some micro-animals and plants. Viruses are generally regarded as not living and therefore not considered to be microorganisms, although a subfield of microbiology is virology , the study of viruses.

  4. Microbiota - Wikipedia

    en.wikipedia.org/wiki/Microbiota

    The predominant species of bacteria on human skin. All plants and animals, from simple life forms to humans, live in close association with microbial organisms. [12] Several advances have driven the perception of microbiomes, including:

  5. Kingdom (biology) - Wikipedia

    en.wikipedia.org/wiki/Kingdom_(biology)

    But despite the development from two kingdoms to five among most scientists, some authors as late as 1975 continued to employ a traditional two-kingdom system of animals and plants, dividing the plant kingdom into subkingdoms Prokaryota (bacteria and cyanobacteria), Mycota (fungi and supposed relatives), and Chlorota (algae and land plants). [14]

  6. Germ theory of disease - Wikipedia

    en.wikipedia.org/wiki/Germ_theory_of_disease

    These small organisms, which are too small to be seen without magnification, invade animals, plants, and even bacteria. Their growth and reproduction within their hosts can cause disease. "Germ" refers not just to bacteria but to any type of microorganism, such as protists or fungi , or other pathogens, including parasites , viruses , prions ...

  7. Unicellular organism - Wikipedia

    en.wikipedia.org/wiki/Unicellular_organism

    [36] [37] Protozoa, like plants and animals, can be considered heterotrophs or autotrophs. [33] Autotrophs like Euglena are capable of producing their energy using photosynthesis, while heterotrophic protozoa consume food by either funneling it through a mouth-like gullet or engulfing it with pseudopods, a form of phagocytosis . [ 33 ]

  8. Microbiology - Wikipedia

    en.wikipedia.org/wiki/Microbiology

    Microbiology (from Ancient Greek μῑκρος (mīkros) 'small' βίος (bíos) 'life' and -λογία () 'study of') is the scientific study of microorganisms, those being of unicellular (single-celled), multicellular (consisting of complex cells), or acellular (lacking cells).

  9. Injury in plants - Wikipedia

    en.wikipedia.org/wiki/Injury_in_plants

    Injury in plants is damage caused by other organisms or by the non-living (abiotic) environment to plants. Animals that commonly cause injury to plants include insects, mites, nematodes, and herbivorous mammals; damage may also be caused by plant pathogens including fungi, bacteria, and viruses.