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| style="height:20px; width:400px; text-align:center;" |The under side of a [[leaf]] showing [[Guard Cell|guard cells]] and [[Stoma|stomata]].
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====Edexcel====
:[https://www.amazon.co.uk/gp/product/1782948120/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948120&linkCode=as2&tag=nrjc-21&linkId=dedef775c6a43dbb0a609441525adac0 ''Gas exchange; plants, pages 211-214, GCSE Biology, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1782946748/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946748&linkCode=as2&tag=nrjc-21&linkId=a4f0348fc37d0ba1bb52d27f8679581f ''Gas exchange; plants, pages 72, 73, GCSE Biology; The Revision Guide, CGP, Edexcel '']