- A archaebacteria
- B common eubacteria
- C cyanobacteria
- D simple protists
Correct answer: A. archaebacteria
Explanation: Archaebacteria (archaea) tolerate extreme conditions.
Concept context
Whittaker's five kingdom system covering Monera, Protista, Fungi, plus viruses, viroids, and lichens. A foundational NEET chapter on how living organisms are grouped.