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 distribute oxygen to tissues
D. The principle of countercurrent flow facilitates
Answer:A
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 distribute oxygen to tissues D. The principle of countercurrent flow facilitates