Question
Unicellular organisms are immortal, whereas multicellular organisms are not. Justify.

Answer

  1. Since single$-$celled organisms reproduce by cell division into two $($individuals$),$ there is no natural death for them and hence, they are considered immortal.
  2. In multicellular organisms, reproduction occurs in specialised organs involving specialised cells; their body as a whole dies due to ageing and senescence.

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