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==Beyond the Curriculum==
{{#ev:youtube|https://www.youtube.com/watch?v=hsh2kPdgazo}}
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''Sight, pages 154-157, GCSE Biology; Third Edition, Oxford University Press, AQA '']