What is the main component of bones and teeth?
A. Calcium carbonate
B. Calcium phosphate
C. Calcium sulphate
D. Calcium nitrate
A. Calcium carbonate
B. Calcium phosphate
C. Calcium sulphate
D. Calcium nitrate
A. Medulla oblongata
B. Cerebellum
C. Cerebrum
D. None of these
A. Liver
B. Bone marrow
C. Kidneys
D. Heart
A. Isotopes
B. Isomers
C. Electrode
D. Compound