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OpenStudy (elizabeths):
How do birds keep their lungs filled with oxygenated air?
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OpenStudy (anonymous):
is this multiple choice ?
OpenStudy (koikkara):
@ElizabethS http://www.ck12.org/book/CK-12-Biology-Concepts/r19/section/12.19/ got everything u need to know. WeLcoMe to OpeN stuDy.. !! Wondering If you are satisfied with this answer, Please close this Question. Thank You ! Keep in touch with Open Study.. Bye !
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