Answer: The correct answer is -
Eubacteria and Archaebacteria.
As per the information in the question, scientist finds a new life form and determines that it contains no nuclei.
This indicates that the new life form is a prokaryote.
Prokaryotes are the organisms that are devoid of nucleus and do not contain any membrane bound subcellular compartments (cell organelles).
Archaebacteria (primitive forms of bacteria) and Eubacteria are the two groups of prokaryotes.
Thus, Eubacteria and Archaebacteria is the right answer.
