Organismeu: Béda antarrépisi

[[Asal-usul hirup]] sarta hubungan antara turunan pentingna ngarupakeunmangrupa kontroversi. Dua hambalan nu utama bisa dibédakeun: [[prokariot]] jeung [[eukariot]]. Prokariot sacara umum dianggap ngawakilan dua [[tilu sistim karajaan|karajaan]] nu béda, nyaéta [[baktéri]] jeung [[Archaea]], nu antara masing-masing teu leuwih deukeut batan ka eukariot. Jungkrang antara prokariot jeung eukariot pada nganggap salaku tumbu penting nu pegat dina sajarah évolusionér. Dua [[organél]] eukariotik, nyéta [[mitokondria]] jeung [[kloroplas]], umumna dianggap diturunkeun ti baktéri [[hipotésis éndosimbiotik|éndosimbiotik]].

Salasahijisalah sahiji ukuran dasar organisme nyaéya [[umur hirup]]na. Sababaraha sato hirupna ngan itungan sapoé, sedengkeun sababaraha tutuwuhan bisa hirup réwuan taun. [[Senescence|Aging]] is important when determining life span of most organisms, bacterium, a virus or even a [[prion]].

* [http://www.species2000.org/ Species 2000 Indexing the world's known species]. Species 2000 has the objective of enumerating all known species of plants, animals, fungi and microbes on Earthéarth as the baseline dataset for studies of global biodiversity. It will also provide a simple access point enabling users to link from here to other data systems for all groups of organisms, using direct species-links.

** [http://www.spaceref.com/news/viewnews.html?id=339 SpaceRef.com, May 04, 2001: Redefining "Life as We Know it"] ''Hesiocaeca methanicola'' In 1997, Charles Fisher, professor of biology at Penn State, discovered this remarkable creaturecréature living on mounds of methane ice under half a mile of oceanocéan on the floor of the Gulf of Mexico.