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Which one of the following statement is ...

Which one of the following statement is in correct ?

A

the residual air in lungs slightly decreaes the efficeency of respiration in mammals

B

the presence of non respeiratory air sacs increases the efficiency of respiration in birds

C

in insects circulating body fluids serve to distributed oxygen to tissued

D

the principla of countercurrent flow facilitates efficeent respiration in gills of fishes

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The correct Answer is:
C
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