1) What is the first organ in your respiratory system a) lungs  b) Diaphragm c) bronchi d) nose 2) what is process of inhalation a) breathing in b) co2  c) O2 d) Breathing out 3) What is the function of respiratory system a) breathing b) Digestion c) reproductive  d) None of them 4) in which organ gas exchange is occur? a) lungs b) diaphragm c) both of them d) none of them 5) what is gas is important for humans a) H2 b) Co2 c) O2 d) H2o

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