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Which one of the following statements is...

Which one of the following statements is incorect?

A

The residual air in lungs slightly decreases the efficiency of respiration in mammals.

B

The presence of non - respiratory air sacs increases the effiency or respiration in birds

C

In insects ,circulting body fluids serve to distribute oxygen to tissues

D

The principle of couner-current flow facilitates effcient respiration in gills of dfishes.

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