Carl Von Linnaneus classified the living beings into two kingdoms - 
plant kingdom and animal kingdom
But it was later criticized as it failed to classify organism like euglena, which posses both the characters of plants and animals or fungi, which bear some characters not common to plants.
So, in 1969, R.H whittaker, an american ecologist advocated a five-kingdom system of classification.
Kingdom - Monera,Protista,Fungi,Plantae and Animalia.
This five-kingdom classification system classified all the living organisms in their corect order. Therfore, it is advantageous over Two-Kingdom classification.
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