Which of the following are the three domains proposed in six-kingdom classification?
Bacteria
Archaea
Eukarya
In the past, knowledge about the peculiarities of microorganisms like bacteria was limited. Later it was found that the archaebacteria belonging to the kingdom Monera are different from the other bacteria in cell structure and physiological functions. Then, kingdom Monera was further divided into 2 kingdoms namely: Archaea and Bacteria. Besides this, one more level of classification, named domain, was added above the kingdom. The three domains include Bacteria, Eukarya and Archaea. It was American scientist Carl Woese who proposed six-kingdom classification.