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  2. Living systems - Wikipedia

    en.wikipedia.org/wiki/Living_systems

    Below the level of living systems, he defines space and time, matter and energy, information and entropy, levels of organization, and physical and conceptual factors, and above living systems ecological, planetary and solar systems, galaxies, etc. [3] [4] [5] Miller's central thesis is that the multiple levels of living systems (cells, organs ...

  3. Life - Wikipedia

    en.wikipedia.org/wiki/Life

    Animal corpses, like this African buffalo, are recycled by the ecosystem, providing energy and nutrients for living organisms. Death is the termination of all vital functions or life processes in an organism or cell. [29] [30] One of the challenges in defining death is in distinguishing it from life.

  4. Biological roles of the elements - Wikipedia

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

    5: Essential for all (or most) living things. 4: Essential for some living things. 3: Not essential, but has a pharmacologic role; helps to treat disease in some organisms. 2: Benign: present in some organisms, sometimes bioaccumulating, but generally having no apparent effects (except possible harmful effects, notes "a" or "b"). 1

  5. Natural environment - Wikipedia

    en.wikipedia.org/wiki/Natural_environment

    A diverse variety of living organisms (life forms) can be found in the biosphere on Earth, and properties common to these organisms—plants, animals, fungi, protists, archaea, and bacteria—are a carbon- and water-based cellular form with complex organization and heritable genetic information.

  6. Biological system - Wikipedia

    en.wikipedia.org/wiki/Biological_system

    Examples of biological systems at the macro scale are populations of organisms. On the organ and tissue scale in mammals and other animals, examples include the circulatory system , the respiratory system , and the nervous system .

  7. Biological thermodynamics - Wikipedia

    en.wikipedia.org/wiki/Biological_thermodynamics

    2. The state of a living organism is never static, and all its physiological and energy parameters are always in a state of continuous fluctuations relative to the average values both in frequency and amplitude. This principle of functioning of living organisms provides them with the properties of phenotypic adaptation and a number of others.

  8. Organism - Wikipedia

    en.wikipedia.org/wiki/Organism

    An organism is any living thing that functions as an individual. [1] Such a definition raises more problems than it solves, not least because the concept of an individual is also difficult. Many criteria, few of them widely accepted, have been proposed to define what an organism is.

  9. Ecology - Wikipedia

    en.wikipedia.org/wiki/Ecology

    Ecology (from Ancient Greek οἶκος (oîkos) 'house' and -λογία 'study of') is the natural science of the relationships among living organisms and their environment. Ecology considers organisms at the individual, population , community , ecosystem , and biosphere levels.