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...
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