Posted by U15626221 (U15626221) on Friday, 22nd February 2013 I
don't understand the topic of gas exchange, can someone explain
clearly but in detail please, a few example would help too. Much
appreciated :D Posted by The Bitesize Science Teacher
(U14392404) on Friday, 22nd February 2013 You have answers to
this here: www.bbc.co.uk/dna/mb... This page is best viewed in
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