Which one of the following statements is incorrect?

  • A
    The residual air in lungs slightly decreases the efficiency of respiration in mammals
  • B
    The presence of non-respiratory air sacs,increases the efficiency of respiration in birds
  • C
    In insects,circulating body fluids serve to efficiently distribute oxygen to tissues
  • D
    The principle of countercurrent flow facilitates efficient respiration in gills of fishes

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