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  2. Life - Wikipedia

    en.wikipedia.org/wiki/Life

    [5] [6] [7] This is complicated by a lack of knowledge of the characteristics of living entities, if any, that may have developed outside Earth. [8] [9] Philosophical definitions of life have also been put forward, with similar difficulties on how to distinguish living things from the non-living. [10]

  3. Living systems - Wikipedia

    en.wikipedia.org/wiki/Living_systems

    A presentation on information flow in 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 ...

  4. Biological roles of the elements - Wikipedia

    en.wikipedia.org/wiki/Biological_roles_of_the...

    Essential for almost all living things; needed for chlorophyll, and is a co-factor for many other enzymes; has multiple medical uses. [11] Large doses can have toxic effects. [11] manganese: 25: 5a: Essential for almost all living things, although in very small amounts; it is a cofactor for many classes of enzymes.

  5. Cell theory - Wikipedia

    en.wikipedia.org/wiki/Cell_theory

    All known living things are made up of one or more cells [13] All living cells arise from pre-existing cells by division. The cell is the fundamental unit of structure and function in all living organisms. [14] The activity of an organism depends on the total activity of independent cells. [15] Energy flow (metabolism and biochemistry) occurs ...

  6. Kingdom (biology) - Wikipedia

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

    The classification of living things into animals and plants is an ancient one. Aristotle (384–322 BC) classified animal species in his History of Animals, while his pupil Theophrastus (c. 371 –c. 287 BC) wrote a parallel work, the Historia Plantarum, on plants. [7]

  7. Biomimetics - Wikipedia

    en.wikipedia.org/wiki/Biomimetics

    Living beings have adapted to a constantly changing environment during evolution through mutation, recombination, and selection. [39] The core idea of the biomimetic philosophy is that nature's inhabitants including animals, plants, and microbes have the most experience in solving problems and have already found the most appropriate ways to ...

  8. Human uses of living things - Wikipedia

    en.wikipedia.org/wiki/Human_uses_of_living_things

    More recently, scholars have added a third type of interaction, where living things, whether animals, [6] plants, [7] fungi or microbes function as participants. This makes the relationships bidirectional, explicitly implying various forms of symbiosis in a complex ecology.

  9. Organism - Wikipedia

    en.wikipedia.org/wiki/Organism

    No metabolism, so not living, not an organism, say many biologists; [7] but they evolve, their genes collaborating to manipulate the host [18] Unicellular organism: Paramecium: One cell, with organelles e.g. cilia for specific functions: Yes: Inter-cellular (inter-organismal) signalling [22] Swarming protistan: Dictyostelium (cellular slime ...