Trace the air flow through a bird from inhaling to exhaling,indicating where absorption of gases occurs and for what percent of the time.Why does it take two cycles of breathing to move a molecule in the air through this system?

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The Answer of Trace the air flow through a bird from inhaling to exhaling,indicating where absorption of gases occurs and for what percent of the time.Why does it take two cycles of breathing to move a molecule in the air through this system?

Trace the Air Flow Through a Bird from Inhaling to Exhaling,indicating