what are the disadvantages of 3 kingdom classification system - Biology - Biological Classification

Question

what are the disadvantages of 3 kingdom classification system??

Mamta · Accepted Answer

The three domain system was introduced by Carl Woese on the basis
of differences in the structure sequences of 16S/18S rRNA genes of
eubacteria , archaebacteria and eukaryotes The main disadvantage of
the system is that it classified organisms too usually