Answer:
The correct answer will be- Option-4
Explanation:
Carl Woese is well known for dividing the five-kingdom system into three domains: Archaebacteria (ancient bacteria), Eubacteria and the Eukaryotes on the basis of the studies of the ribosomal RNA.
Since the three-domain system does not include the cyanobacteria group which includes the photosynthetic bacteria therefore, the Cyanobacteria is the correct answer.
Thus, Option-4 is the correct answer.
