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  1. Differences within individuals of the same species are called variations.
  2. Variation can also be defined as ‘Morphological or physiological changes in an organism either due to genetic or environmental factors’.
  3. Variation is a common phenomenon observed in all the living organisms.
  4. Some of these variations may be favourable thereby increasing the chances for survival.
  5. Others may be neutral or harmful.
  6. It is a pre-requisite and progressive factor in evolution.