How was three kingdom system different than four kingdom system?
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The three kingdom classification system was
proposed by Ernst Haeckel in 1866. He did not
distinguish bacteria from other living beings. They
were incorrectly placed under kingdom—Protista. This
shortcoming was removed by Copeland in 1956,
when he placed all the bacteria and related organisms
into another kingdom—Monera. Copeland’s system of
classification was able to separate prokaryotic
organisms from eukaryotic organisms which was a
major drawback of Haeckel’s system of classification.