Living World


  • Being alive is defined as the complex organization of molecules expressing itself through the chemical reactions which lead to the growth, development, responsiveness, adaptation and reproduction.
  • One such distinct function of an organism (living) is growth, which is permanent, irreversible increases in mass.
  • Reproduction is a non-defining property of living organism as it is not mandatory for an organism to sustain a life
  • Metabolism comprises both anabolism and catabolism which is a building up and a breaking down reaction, respectively and is a defining property.
  • To increase the survival rate, living organism induces adaptation.
  • Homeostasis, a defining property, is to maintain a favourable internal environment.
  • Consciousness is the ability to sense the surroundings and respond to it, also considered to be the defining property.

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