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joy

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kwl thanks

wendy

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whT has this got to do wiv anything

Emily

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shut up wendy. Thanks for this natasha. :)

Rhianne

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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

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Thank you :)

adila shaheen

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ov course its part of the syllabus 

sophia khan

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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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