Where do certain symbiotic microorganisms normally occur in human body?
A. Caecum
B. Oral lining and tongue surface
C. Vermiform appendix and rectum
D. Duodenum
Answer:A
Where do certain symbiotic microorganisms normally occur in human body?
A. Caecum B. Oral lining and tongue surface C. Vermiform appendix and rectum D. Duodenum