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OpenStudy (anonymous):
what are tiny air sacs through which oxygen and carbon dioxide pass in and out of the bloodstream.
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OpenStudy (butterflydreamer):
this is a bio question :) But what do you think the air sacs are called?
OpenStudy (butterflydreamer):
take a look at this: http://microbemagic.ucc.ie/explore_body/air_sacs.html
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