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In biology and ecology, an organism (in Greek organon = instrument) is a complex adaptive system of organs that influence each other in such a way that they function as a more or less stable whole and have properties of life.

The origin of life and the relationships between its major lineages are controversial. Two main grades may be distinguished, the prokaryotes and eukaryotes. The prokaryotes are generally considered to represent two separate domains, called the Bacteria and Archaea, which are not closer to one another than to the eukaryotes. The gap between prokaryotes and eukaryotes is widely considered a major missing link in evolutionary history. Two eukaryotic organelles, namely mitochondria and chloroplasts, are generally considered to be derived from endosymbiotic bacteria.

The phrase complex organism describes any organism with more than one cell.


Organizational terminologyEdit

Biological Organization

Viruses Edit

Viruses are not typically considered to be organisms because they are not capable of independent reproduction or metabolism. However, according to the United States Code, they are considered to be microorganisms in the sense of biological weaponry and malicious use. This controversy is problematic, though, since some parasites and endosymbionts are incapable of independent life either. Although viruses do have enzymes and molecules characteristic of living organisms, they are incapable of surviving outside a host cell and most of their metabolic processes require a host and its 'genetic machinery'. The origin of such parasites is uncertain, but it appears most likely that they are derived from their host.

Life span Edit

One of the basic parameters of organism is its life span. Some animals live as short as one day, while some plants can live thousands of years. Aging is important when determining life span of most organisms, bacterium, a virus or even a prion.

See alsoEdit

External linksEdit

ast:Ser vivu bg:Организъм zh-min-nan:Seng-bu̍t ca:Organisme cs:Organismus da:Organisme de:Lebewesen et:Organism es:Ser vivo eo:Organismo fr:Organisme vivant gl:Organismo ko:생물 id:Organisme he:יצור kn:ಸಾವಯವ lt:Organizmas lb:Liewewiesen mk:Организам nl:Organismeno:Organisme nn:Organismept:Organismo ru:Организм su:Organisme fi:Eliö sv:Organismer ta:உயிரினம் th:สิ่งมีชีวิต vi:Sinh vật zh:生物

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