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  2. Integrative level - Wikipedia

    en.wikipedia.org/wiki/Integrative_level

    When arranged this way, each entity is three things at the same time: It is made up of parts from the previous level below. It is a whole in its own right. And it is a part of the whole that is on the next level above. Typical examples include life emerging from non-living substances, and consciousness emerging from nervous systems.

  3. 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 ...

  4. Biological organisation - Wikipedia

    en.wikipedia.org/wiki/Biological_organisation

    Each level in the hierarchy represents an increase in organisational complexity, with each "object" being primarily composed of the previous level's basic unit. [2] The basic principle behind the organisation is the concept of emergence —the properties and functions found at a hierarchical level are not present and irrelevant at the lower levels.

  5. Life - Wikipedia

    en.wikipedia.org/wiki/Life

    All living things contain two types of large molecule, proteins and nucleic acids, the latter usually both DNA and RNA: these carry the information needed by each species, including the instructions to make each type of protein. The proteins, in turn, serve as the machinery which carries out the many chemical processes of life.

  6. Ecology - Wikipedia

    en.wikipedia.org/wiki/Ecology

    The scope of ecology contains a wide array of interacting levels of organization spanning micro-level (e.g., cells) to a planetary scale (e.g., biosphere) phenomena. Ecosystems, for example, contain abiotic resources and interacting life forms (i.e., individual organisms that aggregate into populations which aggregate into distinct ecological ...

  7. Organ (biology) - Wikipedia

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

    The organ level of organisation in animals can be first detected in flatworms and the more derived phyla, i.e. the bilaterians. The less-advanced taxa (i.e. Placozoa, Porifera, Ctenophora and Cnidaria) do not show consolidation of their tissues into organs. More complex animals are composed of different organs, which have evolved over time.

  8. Biological process - Wikipedia

    en.wikipedia.org/wiki/Biological_process

    Living things require energy to maintain internal organization (homeostasis) and to produce the other phenomena associated with life. Growth: maintenance of a higher rate of anabolism than catabolism. A growing organism increases in size in all of its parts, rather than simply accumulating matter.

  9. Organism - Wikipedia

    en.wikipedia.org/wiki/Organism

    Differing levels of biological organisation give rise to potentially different understandings of the nature of organisms. A unicellular organism is a microorganism such as a protist , bacterium , or archaean , composed of a single cell , which may contain functional structures called organelles . [ 22 ]