The main constituent of hemoglobin is_____.
A. Chlorine
B. Iron
C. Calcium
D. None of these
What is the main component of bones and teeth?
A. Calcium carbonate
B. Calcium phosphate
C. Calcium sulphate
D. Calcium nitrate
The largest part of the human brain is the_____.
A. Medulla oblongata
B. Cerebellum
C. Cerebrum
D. None of these
Red blood corpuscles are formed in the_____.
A. Liver
B. Bone marrow
C. Kidneys
D. Heart
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