Q.

Which is incorrect ? (C.B.S.E.2006)

A. Presence of nonrespiratory air sacs increases efficinency of respiration in birds
B. In insects,circulation body fluids serve to distribute oxygen to tissues
C. Principle of counter - current flow facilitates efficient respiration in gills of fishes
D. Residual air in lungs slightly decreases the efficiency of respiration in mammals
Answer» B. In insects,circulation body fluids serve to distribute oxygen to tissues
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