Air moves out of the lungs when the pressure inside the lungs is . Air moves out of the lungs when the pressure inside the lungs is . equal to the pressure in the atmosphere less than the pressure in the atmosphere greater than the pressure in the atmosphere greater than the intra-alveolar pressure Request Answer Provide Feedback

Air moves out of the lungs when the pressure inside the lungs is greater than the pressure in the atmosphere equal to the pressure in the atmosphere less than the pressure in the atmosphere greater than the pressure in the atmosphere greater than the intra-alveolar pressure

Explanation:

The Air we breath  moves from a a region of high pressure to a lower one. As you breath in air into the body system, the air goes  from  your body outside  to the  lungs inside your body , so that the  air in your lungs has a lower pressure.

That is to say, the  pressure in the lungs decreases just as the rib-cage goes  out and up, while the  Air coming from outside gets  in by other air particles  due to constant pressure where the air moves from a high level pressure to a lower one.

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if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.