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  2. 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 ...

  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. What Is Life? - Wikipedia

    en.wikipedia.org/wiki/What_Is_Life?

    What Is Life? The Physical Aspect of the Living Cell is a 1944 science book written for the lay reader by physicist Erwin Schrödinger.The book was based on a course of public lectures delivered by Schrödinger in February 1943, under the auspices of the Dublin Institute for Advanced Studies, where he was Director of Theoretical Physics, at Trinity College, Dublin.

  5. Biological organisation - Wikipedia

    en.wikipedia.org/wiki/Biological_organisation

    Biological organisation is the organisation of complex biological structures and systems that define life using a reductionistic approach. [ 1] The traditional hierarchy, as detailed below, extends from atoms to biospheres. The higher levels of this scheme are often referred to as an ecological organisation concept, or as the field ...

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

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

    Cavalier-Smith's system of classification. The initial version of a classification system of life by British zoologist Thomas Cavalier-Smith appeared in 1978. [ 1][ 2] This initial system continued to be modified in subsequent versions that were published until he died in 2021. As with classifications of others, such as Carl Linnaeus, Ernst ...

  7. Cell (biology) - Wikipedia

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

    The cell is the basic structural and functional unit of all forms of life. Every cell consists of cytoplasm enclosed within a membrane; many cells contain organelles, each with a specific function. The term comes from the Latin word cellula meaning 'small room'. Most cells are only visible under a microscope.

  8. 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 ...

  9. 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]

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