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2. Non-cellular life - Wikipedia

   en.wikipedia.org/wiki/Non-cellular_life

   Non-cellular life, also known as acellular life, is life that exists without a cellular structure for at least part of its life cycle. [1] Historically, most definitions of life postulated that an organism must be composed of one or more cells, [2] but, for some, this is no longer considered necessary, and modern criteria allow for forms of life based on other structural arrangements.

3. Abiotic component - Wikipedia

   en.wikipedia.org/wiki/Abiotic_component

   Abiotic components include physical conditions and non-living resources that affect living organisms in terms of growth, maintenance, and reproduction. Resources are distinguished as substances or objects in the environment required by one organism and consumed or otherwise made unavailable for use by other organisms.

4. Abiogenesis - Wikipedia

   en.wikipedia.org/wiki/Abiogenesis

   NASA's 2015 strategy for astrobiology aimed to solve the puzzle of the origin of life – how a fully functioning living system could emerge from non-living components – through research on the prebiotic origin of life's chemicals, both in space and on planets, as well as the functioning of early biomolecules to catalyse reactions and support inheritance.

5. River ecosystem - Wikipedia

   en.wikipedia.org/wiki/River_ecosystem

   This stream operating together with its environment can be thought of as forming a river ecosystem. River ecosystems are flowing waters that drain the landscape, and include the biotic (living) interactions amongst plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions of its many parts.

6. Outline of life forms - Wikipedia

   en.wikipedia.org/wiki/Outline_of_life_forms

   A life form (also spelled life-form or lifeform) is an entity that is living, [1] [2] such as plants , animals , and fungi . It is estimated that more than 99% of all species that ever existed on Earth, amounting to over five billion species, [3] are extinct. [4] [5] Earth is the only celestial body known to harbor life forms. No form of ...

7. List of life sciences - Wikipedia

   en.wikipedia.org/wiki/List_of_life_sciences

   Different kinds of living creatures studied in life sciences top: microorganisms (E. coli bacteria) and an animal (Goliath beetle) bottom: a plant (tree fern) and humans Part of a series on Science General History Literature Method Philosophy Branches Formal Natural Physical Life Social Applied In society Communication Community Education Funding Policy Pseudoscience Scientist Science portal ...