Evolution in respiration

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Across
  1. 3. Type of respiration in human beings
  2. 7. Respiratory organs in pulmonary respiration
  3. 8. Type of respiration observed in hydra
  4. 10. Respiratory organs involved in branchial respiration
  5. 11. An insect which has tracheal respiratory system.
  6. 12. Respiratory organ involved in cutaneous respiration
Down
  1. 1. An animal which can perform both pulmonary and cutaneous respiration.
  2. 2. Site of respiratory reactions in prokaryotic cells
  3. 4. Type of respiration observed in earthworm
  4. 5. Oxygen binding factor in blood
  5. 6. Respiration takes place in presence of oxygen
  6. 9. Brachial respiratory system observed in....