Q: Birds have air sacs that store inhaled air and push it into their what?


Read this paragraph and choose the correct option from the provided answers:

Birds have air sacs that store inhaled air and push it into the lungs like bellows. This keeps the lungs constantly filled with oxygenated air. The lungs also contain millions of tiny passages that create a very large surface area for gas exchange with the blood (see Figure below ).

 Choices:

- beaks

- bones

- abdomens

- lungs


A:
lungs