RESPIRATION IN ORGANISMS

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Across
  1. 2. Muscular floor of chest cavity
  2. 3. The respiratory organs of human beings
  3. 5. An organism with tracheal system
  4. 6. Tiny pores on the surface of leaf
  5. 8. The air tubes of insects
  6. 9. Openings on the sides of the body of an insect
Down
  1. 1. Skeletal structures surrounding chest cavity
  2. 4. The openings through which we inhale
  3. 7. An anaerobic organism