A. a horn-like material
B. dead cells
C. useless portions of the body
D. not connected with the blood stream
A. veins to arteries
B. heart to lungs
C. arteries to veins
D. heart to the body
A. go to sleep immediately and rest
B. take a long walk
C. take some vitamins
D. read interesting articles
A. blood
B. kidneys
C. skin
D. liver
A. proteins
B. fats
C. vitamins
D. carbohydrates
A. enters the stomach
B. reaches intestines
C. enters the mouth
D. thoroughly mixes
A. pure
B. aerobic
C. pathogenic
D. auto-tropic
A. nitrogen
B. sulphur
C. carbon
D. sodium
A. science of the various kinds of serum
B. artificial rearing of fish
C. art of silkworm breeding
D. study of various cultures of a community