Comments

joy

kwl thanks

wendy

whT has this got to do wiv anything

Emily

shut up wendy. Thanks for this natasha. :)

Rhianne

Wendy does have a point... Im doing AS AQA Biology and I haven't seen this in the syllabus! Perhaps this is GCSE or something? Confused!!!

Morgan

Thank you :)

adila shaheen

ov course its part of the syllabus 

sophia khan

umm Rhianne i think you have the wrong syllabus cause this is definitly in it. Also it is in the course textbook so have a read.

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