Human beings have a significant ability to maintain and moderate the respiratory rhythm to suit the de mand of body tissues-substantiate.

Write the name of phylum. a) Diploblastic, tissue grade of organisation, symmetrical, polymorphic animals. . b) Soft bodied, Unsegmented, Bilaterally symmetrical animals with open type circulation. c) Triploblastic, bilaterally symmetrical, true coelomic animals with metamerism, closed circulation. d) Triploblastic, chitinous exoskeleton and open parasitic on human beings.