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2. Domain (biology) - Wikipedia

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

   Intermediate minor rankings are not shown. In biological taxonomy, a domain ( / dəˈmeɪn / or / doʊˈmeɪn /) ( Latin: regio [1] ), also dominion, [2] superkingdom, realm, or empire, is the highest taxonomic rank of all organisms taken together. It was introduced in the three-domain system of taxonomy devised by Carl Woese, Otto Kandler and ...

3. Life - Wikipedia

   en.wikipedia.org/wiki/Life

   Life is a quality that distinguishes matter that has biological processes, such as signaling and self-sustaining processes, from matter that does not. It is defined descriptively by the capacity for homeostasis, organisation, metabolism, growth, adaptation, response to stimuli, and reproduction. All life over time eventually reaches a state of ...

4. Cell theory - Wikipedia

   en.wikipedia.org/wiki/Cell_theory

   In biology, cell theory is a scientific theory first formulated in the mid-nineteenth century, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells. Cells are the basic unit of structure in all living organisms and also the basic unit ...

5. Cavalier-Smith's system of classification - Wikipedia

   en.wikipedia.org/wiki/Cavalier-Smith's_system_of...

   By 1998, Cavalier-Smith had reduced the total number of kingdoms from eight to six: Animalia, Protozoa, Fungi, Plantae (including red and green algae ), Chromista, and Bacteria. [44] Five of Cavalier-Smith's kingdoms are classified as eukaryotes as shown in the following scheme: Eubacteria. Neomura.

6. Three-domain system - Wikipedia

   en.wikipedia.org/wiki/Three-domain_system

   Three-domain system. The three-domain system is a taxonomic classification system that groups all cellular life into three domains, namely Archaea, Bacteria and Eukarya, introduced by Carl Woese, Otto Kandler and Mark Wheelis in 1990. [1] The key difference from earlier classifications such as the two-empire system and the five-kingdom ...

7. Living systems - Wikipedia

   en.wikipedia.org/wiki/Living_systems

   Living systems are life forms (or, more colloquially known as living things) treated as a system. They are said to be open self-organizing and said to interact with their environment. These systems are maintained by flows of information, energy and matter. Multiple theories of living systems have been proposed.

8. Tree of life (biology) - Wikipedia

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

   Tree of life (biology) The tree of life or universal tree of life is a metaphor, conceptual model, and research tool used to explore the evolution of life and describe the relationships between organisms, both living and extinct, as described in a famous passage in Charles Darwin 's On the Origin of Species (1859). [1]

9. Protocell - Wikipedia

   en.wikipedia.org/wiki/Protocell

   The basic assumption of the chemoton model is that life should fundamentally and essentially have three properties: metabolism, self-replication, and a bilipid membrane. The metabolic and replication functions together form an autocatalytic subsystem necessary for the basic functions of life, and a membrane encloses this subsystem to separate ...