Difference between revisions of "Living thing"

From Biology-Online Dictionary | Biology-Online Dictionary
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'''Definition'''
 
'''Definition'''
  
''noun''
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''noun, plural: living things''
  
 
Any organism or a living form that possesses or shows the characteristics of [[life]] or being [[alive]]
 
Any organism or a living form that possesses or shows the characteristics of [[life]] or being [[alive]]
  
 
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'''Supplement'''
 
'''Supplement'''
  
Living things are those that display the following characteristics
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Living things are those that display the following characteristics:
 
*an organized structure, being made up of a [[cell]] or [[cells]]
 
*an organized structure, being made up of a [[cell]] or [[cells]]
 
*requires [[energy]] to survive or sustain  existence
 
*requires [[energy]] to survive or sustain  existence
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*ability to respire
 
*ability to respire
  
Examples of living things include the [[bacteria]], [[protozoa]], [[plants]], [[fungi]], [[animals]], [[humans]], ''etc''. [[Viruse]]s are not absolutely living or non-living. When outside their [[host]], [[virus]]es are inactive and seemingly inanimate. When inside their host, they became active and alive, capable of utilizing the [[host cell]]'s structures and replicate.
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Thus, a living thing refers to any organism or form that has [[life]]. Life is characterized by exhibiting biological processes, e.g. [[mitosis]], [[reproduction]], [[assimilation]], [[homeostasis]], [[signaling]], [[apoptosis]], etc.
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Examples of living things include the [[bacteria]], [[protozoa]], [[plants]], [[fungi]], [[animals]], [[humans]], ''etc''. [[Virus]]es are not absolutely living or non-living. When outside their [[host]], [[virus]]es are inactive and seemingly inanimate. When inside their host, they became active and alive, capable of utilizing the [[host cell]]'s structures and replicate.  
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Living things are classified by eight major taxonomic levels: [[domain]], [[kingdom]], [[phyla]], [[class]], [[order]], [[family]], [[genus]], and [[species]]. The three-domain system of biological classification as proposed by Carl Woese and others (in 1977) classifies living things into domains: [[archaea]] (archaeabacteria), [[bacteria]] (eubacteria), and [[eucarya]] ([[eukaryote]]s).
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''Compare:''  
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''See also:''  
*[[non-living thing]]
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* [[non-living thing]]
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* [[life]]
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* [[organism]]
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* [[biome]]
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* [[homeostasis]]
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* [[mitosis]]
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* [[apoptosis]]

Revision as of 05:39, 15 January 2017

Definition

noun, plural: living things

Any organism or a living form that possesses or shows the characteristics of life or being alive


Supplement

Living things are those that display the following characteristics:

  • an organized structure, being made up of a cell or cells
  • requires energy to survive or sustain existence
  • ability to reproduce
  • ability to grow
  • ability to metabolize
  • ability to respond to stimuli
  • ability to adapt to the environment
  • ability to move
  • ability to respire

Thus, a living thing refers to any organism or form that has life. Life is characterized by exhibiting biological processes, e.g. mitosis, reproduction, assimilation, homeostasis, signaling, apoptosis, etc.

Examples of living things include the bacteria, protozoa, plants, fungi, animals, humans, etc. Viruses are not absolutely living or non-living. When outside their host, viruses are inactive and seemingly inanimate. When inside their host, they became active and alive, capable of utilizing the host cell's structures and replicate.

Living things are classified by eight major taxonomic levels: domain, kingdom, phyla, class, order, family, genus, and species. The three-domain system of biological classification as proposed by Carl Woese and others (in 1977) classifies living things into domains: archaea (archaeabacteria), bacteria (eubacteria), and eucarya (eukaryotes).


See also: