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Please help me - fill in the blank
a) Blood that leaves the air sacs is rich in the gas ________________. b) When breathing out, the breathe is rich in _______________ _______________. c) If you trace the path of air moving through the respiratory system ,it would enter through the mouth and ________________. It continues through the _________________, into the __________________, through the _______________ tubes and finally reach the ___________ ______________.
